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Title: THE GJ1214 SUPER-EARTH SYSTEM: STELLAR VARIABILITY, NEW TRANSITS, AND A SEARCH FOR ADDITIONAL PLANETS

Abstract

The super-Earth GJ1214b transits a nearby M dwarf that exhibits a 1% intrinsic variability in the near-infrared. Here, we analyze new observations to refine the physical properties of both the star and planet. We present three years of out-of-transit photometric monitoring of the stellar host GJ1214 from the MEarth Observatory and find the rotation period to be long, most likely an integer multiple of 53 days, suggesting low levels of magnetic activity and an old age for the system. We show that such variability will not pose significant problems to ongoing studies of the planet's atmosphere with transmission spectroscopy. We analyze two high-precision transit light curves from ESO's Very Large Telescope (VLT) along with seven others from the MEarth and Fred Lawrence Whipple Observatory 1.2 m telescopes, finding physical parameters for the planet that are consistent with previous work. The VLT light curves show tentative evidence for spot occultations during transit. Using two years of MEarth light curves, we place limits on additional transiting planets around GJ1214 with periods out to the habitable zone of the system. We also improve upon the previous photographic V-band estimate for the star, finding V = 14.71 {+-} 0.03.

Authors:
; ; ; ; ;  [1];  [2];  [3]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States)
  2. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)
  3. Fred Lawrence Whipple Observatory, Smithsonian Astrophysical Observatory, 670 Mount Hopkins Road, Amado, AZ 85645 (United States)
Publication Date:
OSTI Identifier:
21578359
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 736; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/736/1/12; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DWARF STARS; ECLIPSE; MONITORING; PHOTOMETRY; PLANETS; ROTATION; STARSPOTS; MOTION; STARS; STELLAR ACTIVITY

Citation Formats

Berta, Zachory K., Charbonneau, David, Bean, Jacob, Irwin, Jonathan, Burke, Christopher J., Desert, Jean-Michel, Nutzman, Philip, and Falco, Emilio E., E-mail: zberta@cfa.harvard.edu. THE GJ1214 SUPER-EARTH SYSTEM: STELLAR VARIABILITY, NEW TRANSITS, AND A SEARCH FOR ADDITIONAL PLANETS. United States: N. p., 2011. Web. doi:10.1088/0004-637X/736/1/12.
Berta, Zachory K., Charbonneau, David, Bean, Jacob, Irwin, Jonathan, Burke, Christopher J., Desert, Jean-Michel, Nutzman, Philip, & Falco, Emilio E., E-mail: zberta@cfa.harvard.edu. THE GJ1214 SUPER-EARTH SYSTEM: STELLAR VARIABILITY, NEW TRANSITS, AND A SEARCH FOR ADDITIONAL PLANETS. United States. doi:10.1088/0004-637X/736/1/12.
Berta, Zachory K., Charbonneau, David, Bean, Jacob, Irwin, Jonathan, Burke, Christopher J., Desert, Jean-Michel, Nutzman, Philip, and Falco, Emilio E., E-mail: zberta@cfa.harvard.edu. Wed . "THE GJ1214 SUPER-EARTH SYSTEM: STELLAR VARIABILITY, NEW TRANSITS, AND A SEARCH FOR ADDITIONAL PLANETS". United States. doi:10.1088/0004-637X/736/1/12.
@article{osti_21578359,
title = {THE GJ1214 SUPER-EARTH SYSTEM: STELLAR VARIABILITY, NEW TRANSITS, AND A SEARCH FOR ADDITIONAL PLANETS},
author = {Berta, Zachory K. and Charbonneau, David and Bean, Jacob and Irwin, Jonathan and Burke, Christopher J. and Desert, Jean-Michel and Nutzman, Philip and Falco, Emilio E., E-mail: zberta@cfa.harvard.edu},
abstractNote = {The super-Earth GJ1214b transits a nearby M dwarf that exhibits a 1% intrinsic variability in the near-infrared. Here, we analyze new observations to refine the physical properties of both the star and planet. We present three years of out-of-transit photometric monitoring of the stellar host GJ1214 from the MEarth Observatory and find the rotation period to be long, most likely an integer multiple of 53 days, suggesting low levels of magnetic activity and an old age for the system. We show that such variability will not pose significant problems to ongoing studies of the planet's atmosphere with transmission spectroscopy. We analyze two high-precision transit light curves from ESO's Very Large Telescope (VLT) along with seven others from the MEarth and Fred Lawrence Whipple Observatory 1.2 m telescopes, finding physical parameters for the planet that are consistent with previous work. The VLT light curves show tentative evidence for spot occultations during transit. Using two years of MEarth light curves, we place limits on additional transiting planets around GJ1214 with periods out to the habitable zone of the system. We also improve upon the previous photographic V-band estimate for the star, finding V = 14.71 {+-} 0.03.},
doi = {10.1088/0004-637X/736/1/12},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 736,
place = {United States},
year = {2011},
month = {7}
}