TY - JOUR
T1 - HD 97658 and its super-Earth
AU - Van Grootel, V.
AU - Gillon, M.
AU - Valencia, D.
AU - Madhusudhan, N.
AU - Dragomir, D.
AU - Howe, A. R.
AU - Burrows, A. S.
N1 - Publisher Copyright:
© Owned by the authors, published by EDP Sciences, 2015.
PY - 2015/9/23
Y1 - 2015/9/23
N2 - 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 M) 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 = 7.55-0.79+0.83 M) and large (RP = 2.247-0.095+0.098 R at 4.5 μm 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.
AB - 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 M) 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 = 7.55-0.79+0.83 M) and large (RP = 2.247-0.095+0.098 R at 4.5 μm 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.
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U2 - 10.1051/epjconf/201510102006
DO - 10.1051/epjconf/201510102006
M3 - Conference article
AN - SCOPUS:84960193876
SN - 2101-6275
VL - 101
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 02006
T2 - CoRoT Symposium 3, Kepler KASC-7 Joint Meeting on Space Photometry Revolution
Y2 - 6 July 2014 through 11 July 2014
ER -