TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR
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...
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2015
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| Online Access: | http://hdl.handle.net/1721.1/94587 https://orcid.org/0000-0002-6892-6948 |
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| author | Van Grootel, V. Gillon, M. Valencia, D. Madhusudhan, Nikku Dragomir, Diana Howe, A. R. Burrows, Adam Deming, Drake Ehrenreich, D. Lovis, Christophe Mayor, Michel Pepe, F. Queloz, D. Scuflaire, R. Segransan, D. Udry, S. Demory, Brice-Olivier Seager, Sara |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Van Grootel, V. Gillon, M. Valencia, D. Madhusudhan, Nikku Dragomir, Diana Howe, A. R. Burrows, Adam Deming, Drake Ehrenreich, D. Lovis, Christophe Mayor, Michel Pepe, F. Queloz, D. Scuflaire, R. Segransan, D. Udry, S. Demory, Brice-Olivier Seager, Sara |
| author_sort | Van Grootel, V. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T08:50:15Z |
| format | Article |
| id | mit-1721.1/94587 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:50:15Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
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| spelling | mit-1721.1/945872022-09-23T14:51:33Z TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR Van Grootel, V. Gillon, M. Valencia, D. Madhusudhan, Nikku Dragomir, Diana Howe, A. R. Burrows, Adam Deming, Drake Ehrenreich, D. Lovis, Christophe Mayor, Michel Pepe, F. Queloz, D. Scuflaire, R. Segransan, D. Udry, S. Demory, Brice-Olivier Seager, Sara Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Massachusetts Institute of Technology. Department of Physics Demory, Brice-Olivier Seager, Sara 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. United States. National Aeronautics and Space Administration 2015-02-18T16:32:54Z 2015-02-18T16:32:54Z 2014-04 2014-01 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/94587 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 https://orcid.org/0000-0002-6892-6948 en_US http://dx.doi.org/10.1088/0004-637X/786/1/2 The Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing American Astronomical Society |
| spellingShingle | Van Grootel, V. Gillon, M. Valencia, D. Madhusudhan, Nikku Dragomir, Diana Howe, A. R. Burrows, Adam Deming, Drake Ehrenreich, D. Lovis, Christophe Mayor, Michel Pepe, F. Queloz, D. Scuflaire, R. Segransan, D. Udry, S. Demory, Brice-Olivier Seager, Sara TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR |
| title | TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR |
| title_full | TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR |
| title_fullStr | TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR |
| title_full_unstemmed | TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR |
| title_short | TRANSIT CONFIRMATION AND IMPROVED STELLAR AND PLANET PARAMETERS FOR THE SUPER-EARTH HD 97658 b AND ITS HOST STAR |
| title_sort | transit confirmation and improved stellar and planet parameters for the super earth hd 97658 b and its host star |
| url | http://hdl.handle.net/1721.1/94587 https://orcid.org/0000-0002-6892-6948 |
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