TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR
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Grootel-2014-Transit confirmation.pdf
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Author(s)
Van Grootel, V.
Gillon, M.
Valencia, D.
Madhusudhan, Nikku
Dragomir, Diana
Howe, A. R.
Burrows, Adam
Deming, Drake
Ehrenreich, D.
Lovis, Christophe
Date Issued
April 2014
Journal
The Astrophysical Journal
Publisher
IOP Publishing
Citation
Van Grootel, V., M. Gillon, D. Valencia, N. Madhusudhan, D. Dragomir, A. R. Howe, A. S. Burrows, et al. “TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR.” The Astrophysical Journal 786, no. 1 (April 8, 2014): 2. © 2014 The American Astronomical Society
Version
Final published version
Abstract
Super-Earths transiting nearby bright stars are key objects that simultaneously allow for accurate measurements of both their mass and radius, providing essential constraints on their internal composition. We present here the confirmation, based on Spitzer transit observations, that the super-Earth HD 97658 b transits its host star. HD 97658 is a low-mass (M [subscript *] = 0.77 ± 0.05 M [subscript ☉]) K1 dwarf, as determined from the Hipparcos parallax and stellar evolution modeling. To constrain the planet parameters, we carry out Bayesian global analyses of Keck-High Resolution Echelle Spectrometer (Keck-HIRES) radial velocities and Microvariability and Oscillations of STars (MOST) and Spitzer photometry. HD 97658 b is a massive (M[subscript P] = 7.55[+0.83 over -0.79] M[subscript ⊕]) and large (R[subscript P] = 2.247[+0.098 over -0.095] R[subscript ⊕] at 4.5 μm) super-Earth. We investigate the possible internal compositions for HD 97658 b. Our results indicate a large rocky component, of at least 60% by mass, and very little H-He components, at most 2% by mass. We also discuss how future asteroseismic observations can improve the knowledge of the HD 97658 system, in particular by constraining its age. Orbiting a bright host star, HD 97658 b will be a key target for upcoming space missions such as the Transiting Exoplanet Survey Satellite (TESS), the Characterizing Exoplanet Satellite (CHEOPS), the Planetary Transits and Oscillations of stars (PLATO), and the James Webb Space Telescope to characterize thoroughly its structure and atmosphere.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1088/0004-637X/786/1/2
