TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet
| Autor: | J. Haldemann, Eric L. N. Jensen, Enric Palle, Damien Ségransan, Roland Vanderspek, James S. Jenkins, Rafael Luque, Coel Hellier, Caroline Dorn, Matías R. Díaz, Johanna Teske, Stephen A. Shectman, Maxime Marmier, Ian Wong, Erin Flowers, Sara Seager, David W. Latham, Sharon X. Wang, Louise D. Nielsen, Julia V. Seidel, Joshua N. Winn, Douglas A. Caldwell, Stephen R. Kane, Ravit Helled, François Bouchy, Nicholas M. Law, Mark E. Rose, Kevin I. Collins, Jack J. Lissauer, Andrew W. Mann, Avi Shporer, Angie Wolfgang, J. F. Otegi, David R. Anderson, George R. Ricker, Jeffrey D. Crane, Jason D. Eastman, Karen A. Collins, Jennifer Burt, Stéphane Udry, Teo Mocnik, Carl Ziegler, Guillermo Torres, Fabo Feng, R. Paul Butler, Thomas Barclay, Jon M. Jenkins |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Neptune Long period 0103 physical sciences media_common.cataloged_instance Astrophysics::Solar and Stellar Astrophysics European union 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics QB600 0105 earth and related environmental sciences media_common Physics Earth and Planetary Astrophysics (astro-ph.EP) European research Astronomy and Astrophysics Space and Planetary Science Christian ministry Astrophysics::Earth and Planetary Astrophysics Administration (government) Humanities QB799 Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astronomical Journal |
| ISSN: | 0004-6256 0004-637X 1538-3873 1538-3881 0067-0049 2515-5172 0004-6361 0726-3252 |
| DOI: | 10.17615/wy32-jh16 |
| Popis: | The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here we present the detection and mass measurement of a small, short-period ($\approx\,4$\,days) transiting planet around the bright ($V=7.9$), solar-type star HD 86226 (TOI-652, TIC 22221375), previously known to host a long-period ($\sim$1600 days) giant planet. HD 86226c (TOI-652.01) has a radius of $2.16\pm0.08$ $R_{\oplus}$ and a mass of 7.25$^{+1.19}_{-1.12}$ $M_{\oplus}$ based on archival and new radial velocity data. We also update the parameters of the longer-period, not-known-to-transit planet, and find it to be less eccentric and less massive than previously reported. The density of the transiting planet is $3.97$ g cm$^{-3}$, which is low enough to suggest that the planet has at least a small volatile envelope, but the mass fractions of rock, iron, and water are not well-constrained. Given the host star brightness, planet period, and location of the planet near both the ``radius gap'' and the ``hot Neptune desert'', HD 86226c is an interesting candidate for transmission spectroscopy to further refine its composition. Accepted in AJ on 22 June 2020 |
| Databáze: | OpenAIRE |
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