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http://hdl.handle.net/20.500.12386/32027
Titolo: | Wolf 503 b: Characterization of a Sub-Neptune Orbiting a Metal-poor K Dwarf | Autori: | Polanski, Alex S. Crossfield, Ian J. M. Burt, Jennifer A. Nowak, Grzegorz López-Morales, Mercedes Mortier, Annelies PORETTI, Ennio Behmard, Aida Benneke, Björn Blunt, Sarah BONOMO, ALDO STEFANO Butler, R. Paul Chontos, Ashley COSENTINO, Rosario Crane, Jeffrey D. Dumusque, Xavier Fulton, Benjamin J. Ghedina, Adriano Gorjian, Varoujan Grunblatt, Samuel K. HARUTYUNYAN, AVET Howard, Andrew W. Isaacson, Howard Kosiarek, Molly R. Latham, David W. Luque, Rafael Martinez Fiorenzano, Aldo F. Mayor, Michel Mills, Sean M. MOLINARI, Emilio Carlo Nagel, Evangelos Pallé, Enric Petigura, Erik A. Shectman, Stephen A. SOZZETTI, Alessandro Teske, Johanna K. Wang, Sharon Xuesong Weiss, Lauren M. |
Data pubblicazione: | 2021 | Rivista: | THE ASTRONOMICAL JOURNAL | Numero: | 162 | Fascicolo: | 6 | Da pagina:: | 238 | Abstract: | Using radial-velocity measurements from four instruments, we report the mass and density of a 2.043 ±0.069 R <SUB>⊕</SUB> sub-Neptune orbiting the quiet K-dwarf Wolf 503 (HIP 67285). In addition, we present improved orbital and transit parameters by analyzing previously unused short-cadence K2 campaign 17 photometry and conduct a joint radial-velocity-transit fit to constrain the eccentricity at 0.41 ± 0.05. The addition of a transit observation by Spitzer also allows us to refine the orbital ephemeris in anticipation of further follow-up. Our mass determination, 6.26 ${}_{-0.70}^{+0.69}$ M <SUB>⊕</SUB> , in combination with the updated radius measurements, gives Wolf 503 b a bulk density of $\rho ={2.92}_{-0.44}^{+0.50}$ g cm<SUP>-3</SUP>. Using interior composition models, we find this density is consistent with an Earth-like core with either a substantial H<SUB>2</SUB>O mass fraction (45 ${}_{-16}^{+19}$ %) or a modest H/He envelope (0.5% ± 0.3%). The low H/He mass fraction, along with the old age of Wolf 503 (11 ± 2 Gyr), makes this sub-Neptune an opportune subject for testing theories of XUV-driven mass loss while the brightness of its host (J = 8.3 mag) makes it an attractive target for transmission spectroscopy. | URI: | http://hdl.handle.net/20.500.12386/32027 | URL: | https://api.elsevier.com/content/abstract/scopus_id/85120003784 https://iopscience.iop.org/article/10.3847/1538-3881/ac1590 |
ISSN: | 0004-6256 | DOI: | 10.3847/1538-3881/ac1590 | Bibcode ADS: | 2021AJ....162..238P | Fulltext: | open |
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