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Title: A surprising dynamical mass for V773 Tau B

Abstract

Here, we report on new high-resolution imaging and spectroscopy on the multiple T Tauri star system V773 Tau over the 2003-2009 period. With these data we derive relative astrometry, photometry between the A and B components, and radial velocity (RV) of the A-subsystem components. Combining these new data with previously published astrometry and RVs, we update the relative A-B orbit model. This updated orbit model, the known system distance, and A-subsystem parameters yield a dynamical mass for the B component for the first time. Remarkably, the derived B dynamical mass is in the range 1.7-3.0 M⊙. This is much higher than previous estimates and suggests that like A, B is also a multiple stellar system. Among these data, spatially resolved spectroscopy provides new insight into the nature of the B component. Similar to A, these near-IR spectra indicate that the dominant source in B is of mid-K spectral type. If B is in fact a multiple star system as suggested by the dynamical mass estimate, the simplest assumption is that B is composed of similar ~1.2 M ⊙ pre-main-sequence stars in a close (<1 AU) binary system. This inference is supported by line-shape changes in near-IR spectroscopy of B, tentativelymore » interpreted as changing RV among components in V773 Tau B. Relative photometry indicates that B is highly variable in the near-IR. The most likely explanation for this variability is circum-B material resulting in variable line-of-sight extinction. The distribution of this material must be significantly affected by both the putative B multiplicity and the A-B orbit.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Harvard Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  3. Univ. of California, Berkeley, CA (United States); Institut de Planetologie et d'Astrophysique de Grenoble (IPAG), Grenoble (France)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); UCLA, Los Angeles, CA (United States)
  5. UCLA, Los Angeles, CA (United States)
  6. Univ. Bonn, Bonn (Germany); Univ. Nacional Autonoma de Mexico, Michoacan (Mexico)
  7. Univ. Nacional Autonoma de Mexico, Michoacan (Mexico); Max-Planck-Institut fur Radioastronomie, Bonn (Germany)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1343824
Report Number(s):
LLNL-JRNL-504051
Journal ID: ISSN 0004-637X
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 747; Journal Issue: 1; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; stars: fundamental parameters; stars: individuals (V773 Tau); stars: pre-main sequence

Citation Formats

Boden, Andrew F., Torres, Guillermo, Duchene, Gaspard, Konopacky, Quinn, Ghez, A. M., Torres, Rosa M., and Loinard, Laurent. A surprising dynamical mass for V773 Tau B. United States: N. p., 2012. Web. doi:10.1088/0004-637X/747/1/17.
Boden, Andrew F., Torres, Guillermo, Duchene, Gaspard, Konopacky, Quinn, Ghez, A. M., Torres, Rosa M., & Loinard, Laurent. A surprising dynamical mass for V773 Tau B. United States. doi:10.1088/0004-637X/747/1/17.
Boden, Andrew F., Torres, Guillermo, Duchene, Gaspard, Konopacky, Quinn, Ghez, A. M., Torres, Rosa M., and Loinard, Laurent. Fri . "A surprising dynamical mass for V773 Tau B". United States. doi:10.1088/0004-637X/747/1/17. https://www.osti.gov/servlets/purl/1343824.
@article{osti_1343824,
title = {A surprising dynamical mass for V773 Tau B},
author = {Boden, Andrew F. and Torres, Guillermo and Duchene, Gaspard and Konopacky, Quinn and Ghez, A. M. and Torres, Rosa M. and Loinard, Laurent},
abstractNote = {Here, we report on new high-resolution imaging and spectroscopy on the multiple T Tauri star system V773 Tau over the 2003-2009 period. With these data we derive relative astrometry, photometry between the A and B components, and radial velocity (RV) of the A-subsystem components. Combining these new data with previously published astrometry and RVs, we update the relative A-B orbit model. This updated orbit model, the known system distance, and A-subsystem parameters yield a dynamical mass for the B component for the first time. Remarkably, the derived B dynamical mass is in the range 1.7-3.0 M⊙. This is much higher than previous estimates and suggests that like A, B is also a multiple stellar system. Among these data, spatially resolved spectroscopy provides new insight into the nature of the B component. Similar to A, these near-IR spectra indicate that the dominant source in B is of mid-K spectral type. If B is in fact a multiple star system as suggested by the dynamical mass estimate, the simplest assumption is that B is composed of similar ~1.2 M ⊙ pre-main-sequence stars in a close (<1 AU) binary system. This inference is supported by line-shape changes in near-IR spectroscopy of B, tentatively interpreted as changing RV among components in V773 Tau B. Relative photometry indicates that B is highly variable in the near-IR. The most likely explanation for this variability is circum-B material resulting in variable line-of-sight extinction. The distribution of this material must be significantly affected by both the putative B multiplicity and the A-B orbit.},
doi = {10.1088/0004-637X/747/1/17},
journal = {Astrophysical Journal},
number = 1,
volume = 747,
place = {United States},
year = {2012},
month = {2}
}

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