Back to Search
Start Over
HD 97658 and its super-Earth.
- Source :
-
EPJ Web of Conferences . 2015, Vol. 101, p1-4. 4p. - Publication Year :
- 2015
-
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 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SUPER-Earths
*STELLAR mass
*INTERIOR of stars
*ASTRONOMICAL observations
Subjects
Details
- Language :
- English
- ISSN :
- 21016275
- Volume :
- 101
- Database :
- Academic Search Index
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Conference
- Accession number :
- 110029176
- Full Text :
- https://doi.org/10.1051/epjconf/201510102006