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Title: Search for RR Lyrae stars in DES ultrafaint systems: Grus I, Kim 2, Phoenix II, and Grus II

Abstract

Here, we introduce the first search for RR Lyrae stars (RRLs) in four of the ultra-faint systems imaged by the Dark Energy Survey (DES) using SOAR/Goodman and Blanco/DECam imagers. We have detected two RRLs in the field of Grus I, none in Kim 2, one in Phoenix II, and four in Grus II. With the detection of these stars, we accurately determine the distance moduli for these ultra-faint dwarf satellite galaxies; μ0=20.51±0.10 mag (D=127±6 kpc) for Grus I and μ0=20.01±0.10 mag (D=100±5 kpc) for Phoenix II. These measurements are larger than previous estimations by Koposov et al. 2015 and Bechtol et al. 2015, implying larger physical sizes; 5% for Grus I and 33% for Phoenix II. For Grus II, out of the four RRLs detected, one is consistent with being a member of the galactic halo (D=24±1 kpc, μ0=16.86±0.10 mag), another is at D=55±2 kpc (μ0=18.71±0.10 mag), which we associate with Grus II, and the two remaining at D=43±2 kpc (μ0=18.17±0.10 mag). Furthermore, the appearance of a subtle red horizontal branch in the color-magnitude diagram of Grus II at the same brightness level of the latter two RRLs, which are at the same distance and in the same region, suggests that a more metal-rich system may be located in front of Grus II. The most plausible scenario is the association of these starsmore » with the Chenab/Orphan Stream. Finally, we performed a comprehensive and updated analysis of the number of RRLs in dwarf galaxies. This allows us to predict that the method of finding new ultra-faint dwarf galaxies by using two or more clumped RRLs will work only for systems brighter than MV ~ -6 mag.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [3];  [3];  [4];  [5];  [3];  [6];  [7]; ORCiD logo [3];  [8];  [9];  [6];  [10];  [3];  [11]; ORCiD logo [12] more »;  [13];  [14];  [11];  [15]; ORCiD logo [16];  [17];  [18];  [19];  [20];  [11];  [14];  [21];  [6];  [12];  [22]; ORCiD logo [23];  [17];  [18];  [11];  [21];  [24];  [25];  [26];  [11];  [18];  [17];  [27];  [28];  [17]; ORCiD logo [29];  [19];  [11];  [22];  [19];  [30]; ORCiD logo [31];  [32];  [33];  [34];  [35];  [36] « less
  1. Cerro Tololo Inter-American Observatory, NSF’s National Optical-Infrared Astronomy Research Laboratory, Casilla 603, La Serena, Chile
  2. Department of Physics & Astronomy, University of Rochester, 500 Joseph C. Wilson Blvd, Rochester, NY 14627, USA
  3. George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA
  4. Instituto de Física, UFRGS, Caixa Postal 15051, Porto Alegre, RS - 91501-970, Brazil, Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brazil
  5. Department of Physics & Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104-6396, USA
  6. Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA, Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA
  7. LSST, 933 North Cherry Avenue, Tucson, AZ 85721, USA, Department of Physics, 2320 Chamberlin Hall, University of Wisconsin-Madison, 1150 University Avenue Madison, WI 53706-1390, USA
  8. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
  9. Observatories of the Carnegie Institution for Science, 813 Santa Barbara St, Pasadena, CA 91101, USA
  10. Kavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USA
  11. Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA
  12. Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, E-28049 Madrid, Spain
  13. CNRS, UMR 7095, Institut d’Astrophysique de Paris, F-75014 Paris, France, Sorbonne Universités, UPMC Univ Paris 06, UMR 7095, Institut d’Astrophysique de Paris, F-75014 Paris, France
  14. Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UK
  15. Kavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USA, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
  16. Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brazil, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, Spain
  17. Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, IL 61801, USA, National Center for Supercomputing Applications, 1205 West Clark St, Urbana, IL 61801, USA
  18. Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brazil, Observatório Nacional, Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brazil
  19. Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, Spain
  20. Department of Physics, IIT Hyderabad, Kandi, Telangana 502285, India
  21. Santa Cruz Institute for Particle Physics, Santa Cruz, CA 95064, USA
  22. Institut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain, Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona, Spain
  23. Kavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USA, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA, Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA
  24. Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA, Department of Physics, The Ohio State University, Columbus, OH 43210, USA
  25. Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
  26. Australian Astronomical Optics, Macquarie University, North Ryde, NSW 2113, Australia, Lowell Observatory, 1400 Mars Hill Rd, Flagstaff, AZ 86001, USA
  27. Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA, Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA
  28. Institució Catalana de Recerca i Estudis Avançats, E-08010 Barcelona, Spain, Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra (Barcelona) Spain
  29. Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USA
  30. School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK
  31. Department of Physics, Brandeis University, 415 South Street, Waltham, MA 02453, USA
  32. Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brazil, Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, 13083-859, Campinas, SP, Brazil
  33. National Center for Supercomputing Applications, 1205 West Clark St, Urbana, IL 61801, USA
  34. Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA
  35. Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
  36. (
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
DES
OSTI Identifier:
1664588
Alternate Identifier(s):
OSTI ID: 1570191
Report Number(s):
arXiv:1909.06308; FERMILAB-PUB-19-287-AE; DES-2019-0437
Journal ID: ISSN 0035-8711
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 490 Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: dwarf; galaxies: individual (Grus I, Kim 2, Phoenix II, Grus II); stars: horizontal-branch; stars: variables: RR Lyrae

Citation Formats

Martínez-Vázquez, C. E., Vivas, A. K., Gurevich, M., Walker, A. R., McCarthy, M., Pace, A. B., Stringer, K. M., Santiago, B., Hounsell, R., Macri, L., Li, T. S., Bechtol, K., Riley, A. H., Kim, A. G., Simon, J. D., Drlica-Wagner, A., Nadler, E. O., Marshall, J. L., Annis, J., Avila, S., Bertin, E., Brooks, D., Buckley-Geer, E., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., da Costa, L. N., De Vicente, J., Desai, S., Diehl, H. T., Doel, P., Everett, S., Frieman, J., García-Bellido, J., Gaztanaga, E., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hollowood, D. L., Honscheid, K., James, D. J., Kuehn, K., Kuropatkin, N., Maia, M. A. G., Menanteau, F., Miller, C. J., Miquel, R., Paz-Chinchón, F., Plazas, A. A., Sanchez, E., Scarpine, V., Serrano, S., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Swanson, M. E. C., Tarle, G., Vikram, V., and DES Collaboration). Search for RR Lyrae stars in DES ultrafaint systems: Grus I, Kim 2, Phoenix II, and Grus II. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz2609.
Martínez-Vázquez, C. E., Vivas, A. K., Gurevich, M., Walker, A. R., McCarthy, M., Pace, A. B., Stringer, K. M., Santiago, B., Hounsell, R., Macri, L., Li, T. S., Bechtol, K., Riley, A. H., Kim, A. G., Simon, J. D., Drlica-Wagner, A., Nadler, E. O., Marshall, J. L., Annis, J., Avila, S., Bertin, E., Brooks, D., Buckley-Geer, E., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., da Costa, L. N., De Vicente, J., Desai, S., Diehl, H. T., Doel, P., Everett, S., Frieman, J., García-Bellido, J., Gaztanaga, E., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hollowood, D. L., Honscheid, K., James, D. J., Kuehn, K., Kuropatkin, N., Maia, M. A. G., Menanteau, F., Miller, C. J., Miquel, R., Paz-Chinchón, F., Plazas, A. A., Sanchez, E., Scarpine, V., Serrano, S., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Swanson, M. E. C., Tarle, G., Vikram, V., & DES Collaboration). Search for RR Lyrae stars in DES ultrafaint systems: Grus I, Kim 2, Phoenix II, and Grus II. United Kingdom. doi:10.1093/mnras/stz2609.
Martínez-Vázquez, C. E., Vivas, A. K., Gurevich, M., Walker, A. R., McCarthy, M., Pace, A. B., Stringer, K. M., Santiago, B., Hounsell, R., Macri, L., Li, T. S., Bechtol, K., Riley, A. H., Kim, A. G., Simon, J. D., Drlica-Wagner, A., Nadler, E. O., Marshall, J. L., Annis, J., Avila, S., Bertin, E., Brooks, D., Buckley-Geer, E., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., da Costa, L. N., De Vicente, J., Desai, S., Diehl, H. T., Doel, P., Everett, S., Frieman, J., García-Bellido, J., Gaztanaga, E., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hollowood, D. L., Honscheid, K., James, D. J., Kuehn, K., Kuropatkin, N., Maia, M. A. G., Menanteau, F., Miller, C. J., Miquel, R., Paz-Chinchón, F., Plazas, A. A., Sanchez, E., Scarpine, V., Serrano, S., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Swanson, M. E. C., Tarle, G., Vikram, V., and DES Collaboration). Tue . "Search for RR Lyrae stars in DES ultrafaint systems: Grus I, Kim 2, Phoenix II, and Grus II". United Kingdom. doi:10.1093/mnras/stz2609.
@article{osti_1664588,
title = {Search for RR Lyrae stars in DES ultrafaint systems: Grus I, Kim 2, Phoenix II, and Grus II},
author = {Martínez-Vázquez, C. E. and Vivas, A. K. and Gurevich, M. and Walker, A. R. and McCarthy, M. and Pace, A. B. and Stringer, K. M. and Santiago, B. and Hounsell, R. and Macri, L. and Li, T. S. and Bechtol, K. and Riley, A. H. and Kim, A. G. and Simon, J. D. and Drlica-Wagner, A. and Nadler, E. O. and Marshall, J. L. and Annis, J. and Avila, S. and Bertin, E. and Brooks, D. and Buckley-Geer, E. and Burke, D. L. and Carnero Rosell, A. and Carrasco Kind, M. and da Costa, L. N. and De Vicente, J. and Desai, S. and Diehl, H. T. and Doel, P. and Everett, S. and Frieman, J. and García-Bellido, J. and Gaztanaga, E. and Gruen, D. and Gruendl, R. A. and Gschwend, J. and Gutierrez, G. and Hollowood, D. L. and Honscheid, K. and James, D. J. and Kuehn, K. and Kuropatkin, N. and Maia, M. A. G. and Menanteau, F. and Miller, C. J. and Miquel, R. and Paz-Chinchón, F. and Plazas, A. A. and Sanchez, E. and Scarpine, V. and Serrano, S. and Sevilla-Noarbe, I. and Smith, M. and Soares-Santos, M. and Sobreira, F. and Swanson, M. E. C. and Tarle, G. and Vikram, V. and DES Collaboration)},
abstractNote = {Here, we introduce the first search for RR Lyrae stars (RRLs) in four of the ultra-faint systems imaged by the Dark Energy Survey (DES) using SOAR/Goodman and Blanco/DECam imagers. We have detected two RRLs in the field of Grus I, none in Kim 2, one in Phoenix II, and four in Grus II. With the detection of these stars, we accurately determine the distance moduli for these ultra-faint dwarf satellite galaxies; μ0=20.51±0.10 mag (D⊙=127±6 kpc) for Grus I and μ0=20.01±0.10 mag (D⊙=100±5 kpc) for Phoenix II. These measurements are larger than previous estimations by Koposov et al. 2015 and Bechtol et al. 2015, implying larger physical sizes; 5% for Grus I and 33% for Phoenix II. For Grus II, out of the four RRLs detected, one is consistent with being a member of the galactic halo (D⊙=24±1 kpc, μ0=16.86±0.10 mag), another is at D⊙=55±2 kpc (μ0=18.71±0.10 mag), which we associate with Grus II, and the two remaining at D⊙=43±2 kpc (μ0=18.17±0.10 mag). Furthermore, the appearance of a subtle red horizontal branch in the color-magnitude diagram of Grus II at the same brightness level of the latter two RRLs, which are at the same distance and in the same region, suggests that a more metal-rich system may be located in front of Grus II. The most plausible scenario is the association of these stars with the Chenab/Orphan Stream. Finally, we performed a comprehensive and updated analysis of the number of RRLs in dwarf galaxies. This allows us to predict that the method of finding new ultra-faint dwarf galaxies by using two or more clumped RRLs will work only for systems brighter than MV ~ -6 mag.},
doi = {10.1093/mnras/stz2609},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 490,
place = {United Kingdom},
year = {2019},
month = {9}
}

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DOI: 10.1093/mnras/stz2609

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Galaxy formation through hierarchical clustering
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The ACS LCID Project – VIII. The short-period Cepheids of Leo A★
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Metal abundances of RR Lyrae variables in selected Galactic star fields. V - The Lick Astrographic fields at intermediate Galactic latitudes
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Horologium ii: a Second Ultra-Faint Milky way Satellite in the Horologium Constellation
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TRACING THE ORPHAN STREAM TO 55 kpc WITH RR LYRAE STARS
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Mapping the Tidal Destruction of the Hercules Dwarf: A Wide-field DECam Imaging Search for RR Lyrae Stars
journal, January 2018

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The ISLAnds Project. III. Variable Stars in Six Andromeda Dwarf Spheroidal Galaxies
journal, November 2017

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K2-98b: A 32 M NEPTUNE-SIZE PLANET IN A 10 DAY ORBIT TRANSITING AN F8 STAR
journal, November 2016


Hydra ii: a Faint and Compact Milky way Dwarf Galaxy Found in the Survey of the Magellanic Stellar History
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Gaia Data Release 2 : Summary of the variability processing and analysis results
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Modelling the Tucana III stream - a close passage with the LMC
journal, September 2018

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The acs lcid Project. i. Short-Period Variables in the Isolated Dwarf Spheroidal Galaxies Cetus and Tucana
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Measuring Reddening with Sloan Digital sky Survey Stellar Spectra and Recalibrating sfd
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The Missing Satellites of the Magellanic Clouds? Gaia Proper Motions of the Recently Discovered Ultra-faint Galaxies
journal, October 2018

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A deep Study of the Dwarf Satellites Andromeda Xxviii and Andromeda xxix
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Homogeneous Photometry VI: Variable Stars in the Leo I Dwarf Spheroidal Galaxy
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Variable Stars in the Newly Discovered Milky Way Dwarf Spheroidal Satellite Canes Venatici I
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A New Milky Way Dwarf Galaxy in Ursa Major
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Matplotlib: A 2D Graphics Environment
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Variable stars in the Cetus dwarf spheroidal galaxy: population gradients and connections with the star formation history★: Variable stars in the Cetus dSph
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Charting Unexplored Dwarf Galaxy Territory with rr Lyrae
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A MegaCam Survey of Outer Halo Satellites. III. Photometric and Structural Parameters
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RR Lyrae stars as standard candles in the Gaia Data Release 2 Era
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Beasts of the Southern Wild: Discovery of nine Ultra Faint Satellites in the Vicinity of the Magellanic Clouds
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Detection of a 60°-long Dwarf Galaxy Debris Stream
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Clues to the ‘Magellanic Galaxy’ from cosmological simulations: The Magellanic Clouds
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Weak Galactic halo-Fornax dSph connection from RR Lyrae stars
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Chemical Abundances in the Ultra-faint Dwarf Galaxies Grus I and Triangulum II: Neutron-capture Elements as a Defining Feature of the Faintest Dwarfs
journal, January 2019

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Absolute Magnitudes and Colors of RR Lyrae Stars in DECam Passbands from Photometry of the Globular Cluster M5
journal, August 2017

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A Search for rr Lyrae Stars in Segue 2 and Segue 3
journal, September 2013


The ALADIN interactive sky atlas: A reference tool for identification of astronomical sources
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Digging deeper into the Southern skies: a compact Milky Way companion discovered in first-year Dark Energy Survey data
journal, February 2016

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Variable Stars in the Newly Discovered Milky Way Satellite in Bootes
journal, December 2006

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Variable stars in the dwarf irregular galaxy NGC 6822: The photometric catalogue
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The slope of the RR Lyrae MV-[Fe/H] relation
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Variable stars in the Ursa Minor dwarf galaxy
journal, August 1988

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The RR Lyrae Period‐Luminosity Relation. I. Theoretical Calibration
journal, October 2004

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The Early Chemical Enrichment Histories of two Sculptor Group Dwarf Galaxies as Revealed by rr Lyrae Variables
journal, March 2014

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Dark Energy Survey year 1 results: Cosmological constraints from galaxy clustering and weak lensing
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On the Nature of Ultra-faint Dwarf Galaxy Candidates. I. DES1, Eridanus III, and Tucana V
journal, January 2018

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A distance to the Large Magellanic Cloud that is precise to one per cent
journal, March 2019


Pulsating Variable Stars in the coma Berenices Dwarf Spheroidal Galaxy
journal, March 2009


The acs lcid Project. ii. Faint Variable Stars in the Isolated Dwarf Irregular Galaxy ic 1613
journal, March 2010


Gaia DR 2 and VLT/FLAMES search for new satellites of the LMC
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Discovery of two neighbouring satellites in the Carina constellation with MagLiteS
journal, January 2018

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Eight Ultra-Faint Galaxy Candidates Discovered in year two of the dark Energy Survey
journal, November 2015


The contribution of dissolving star clusters to the population of ultra faint objects in the outer halo of the Milky Way
journal, December 2016

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The dark Energy Camera
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On the genealogy of the Orphan Stream
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Smash 1: a very Faint Globular Cluster Disrupting in the Outer Reaches of the lmc?
journal, October 2016

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Variable Stars in the Field of the Hydra ii Ultra-Faint Dwarf Galaxy
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parsec : stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
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RR Lyrae Variables in the Crater II Dwarf Galaxy
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The leo iv Dwarf Spheroidal Galaxy: Color-Magnitude Diagram and Pulsating Stars
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The Dark Energy Survey view of the Sagittarius stream: discovery of two faint stellar system candidates
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Variable Stars and Stellar Populations in Andromeda XXVII. IV. An Off-centered, Disrupted Galaxy
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Ships Passing in the Night: Spectroscopic Analysis of Two Ultra-faint Satellites in the Constellation Carina
journal, April 2018


DAOPHOT - A computer program for crowded-field stellar photometry
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The Imprint of Cosmic Reionization on the Luminosity Function of Galaxies
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Dwarf Spheroidal Satellites of m31. i. Variable Stars and Stellar Populations in Andromeda xix
journal, November 2013

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A prescription for period analysis of unevenly sampled time series
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RR Lyrae Stars in the Field of Sagittarius II
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H α emission in the nebular spectrum of the Type Ia supernova ASASSN-18tb
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Leo p: an Unquenched very Low-Mass Galaxy
journal, October 2015

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New views of the distant stellar halo
journal, June 2017

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Variability and star Formation in leo t, the Lowest Luminosity Star-Forming Galaxy Known Today
journal, August 2012

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Variable Stars and Stellar Populations in Andromeda xxi. ii. Another Merged Galaxy Satellite of m31?
journal, June 2015


Weak Galactic Halo-Dwarf Spheroidal Connection from rr Lyrae Stars
journal, December 2014


The pulsating variable star population in DDO210
journal, November 2015

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Variable stars in Local Group Galaxies – II. Sculptor dSph
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Variable Stars in Local Group Galaxies. III. And VII, NGC 147, and NGC 185: Insight into the Building Blocks of the M31 Halo
journal, June 2017

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The Observed Properties of Dwarf Galaxies in and Around the Local Group
journal, June 2012


Tracing the formation of the Milky Way through ultra metal-poor stars
journal, January 2019

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Magellan/M2fs Spectroscopy of Tucana 2 and grus 1
journal, February 2016

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Structural parameters and blue stragglers in Sagittarius dwarf spheroidal galaxy globular clusters : BSs in Sagittarius globular clusters
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HST/WFPC2 imaging of the dwarf satellites And XI and And XIII: horizontal branch morphology and RR Lyraes★: HST/WFPC2 imaging of And XI and And XIII
journal, November 2011


Distance Scale zero Points from Galactic rr Lyrae star Parallaxes
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The Variable Stars of the Draco Dwarf Spheroidal Galaxy: Revisited
journal, October 2008


RR Lyrae Stars in the Boötes Dwarf Spheroidal Galaxy
journal, September 2006

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The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater
journal, April 2016

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An Orphan in the “Field of Streams”
journal, March 2007

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Is Ursa Major II the progenitor of the Orphan Stream?: The Orphan Stream progenitor
journal, February 2007


The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda VI
journal, September 2002

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Sweating the small stuff: simulating dwarf galaxies, ultra-faint dwarf galaxies, and their own tiny satellites
journal, August 2015

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Stellar Archaeology in the Galactic halo with the Ultra-Faint Dwarfs. vi. ursa Major ii
journal, May 2012


Proper Motions of Milky Way Ultra-faint Satellites with Gaia DR2 × DES DR1
journal, April 2019


Serendipitous Discovery of RR Lyrae Stars in the Leo V Ultra-faint Galaxy
journal, August 2017

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TRIMMING DOWN THE WILLMAN 1 dSph
journal, May 2008


The period-magnitude diagram of RR Lyrae stars -- I. The controversy about the distance scale
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At the survey limits: discovery of the Aquarius 2 dwarf galaxy in the VST ATLAS and the SDSS data
journal, August 2016

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Variable Stars in the Ultra-Faint Dwarf Spheroidal Galaxy ursa Major i
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A Complete Spectroscopic Survey of the Milky way Satellite Segue 1: the Darkest Galaxy
journal, May 2011