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HD 97658 and its super-Earth
Van Grootel, Valérie; Gillon, Michaël; Valencia, D. et al.
2015In European Physical Journal Web of Conferences
 

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Abstract :
[en] 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 the confirmation, based on Spitzer observations, that the super-Earth HD 97658 b transits its host star. HD 97658 is a low-mass (M*=0.77+-0.05 Msun) 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-HIRES radial velocities, and MOST and Spitzer photometry. HD 97658 b is a massive (Mp=7.55 +0.83,-0.79 Mearth) and large (Rp = 2.247 +0.098,-0.095 Rearth at 4.5 microns) super-Earth. We investigate the possible internal compositions for HD 97658 b. Our results indicate a large rocky component, by 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Van Grootel, Valérie  ;  Université de Liège - ULiège
Gillon, Michaël  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Valencia, D.;  Department of Physical and Environmental Sciences, University of Toronto, Canada
Madhusudhan, N.;  Institute of Astronomy, University of Cambridge, UK
Dragomir, D.;  Las Cumbres Observatory Global Telescope Network, USA ; Department of Physics, Broida Hall, UC Santa Barbara, USA
Howe, A. R.;  Department of Astrophysical Sciences, Princeton University, USA
Burrows, A. S.;  Department of Astrophysical Sciences, Princeton University, USA)
Language :
English
Title :
HD 97658 and its super-Earth
Publication date :
01 September 2015
Event name :
The Space Photometry Revolution - CoRoT Symposium 3, Kepler KASC-7 Joint Meeting
Event place :
Toulouse, France
Event date :
6-11 juillet 2014
Audience :
International
Main work title :
European Physical Journal Web of Conferences
Pages :
02006
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