Gandolfi, Davide ORCID: 0000-0001-8627-9628, Fossati, Luca ORCID: 0000-0003-4426-9530, Livingston, John H., Stassun, Keivan G., Grziwa, Sascha, Barragan, Oscar ORCID: 0000-0003-0563-0493, Fridlund, Malcolm ORCID: 0000-0002-0855-8426, Kubyshkina, Daria ORCID: 0000-0001-9137-9818, Persson, Carina M., Dai, Fei, Lam, Kristine W. F., Albrecht, Simon, Batalha, Natalie ORCID: 0000-0002-7030-9519, Beck, Paul G. ORCID: 0000-0003-4745-2242, Justesen, Anders Bo ORCID: 0000-0002-0174-2466, Cabrera, Juan ORCID: 0000-0001-6653-5487, Cartwright, Scott, Cochran, William D., Csizmadia, Szilard, Davies, Misty D., Deeg, Hans J., Eigmueller, Philipp, Endl, Michael, Erikson, Anders, Esposito, Massimiliano, Garcia, Rafael A., Goeke, Robert, Gonzalez-Cuesta, Lucia, Guenther, Eike W., Hatzes, Artie P., Hidalgo, Diego, Hirano, Teruyuki, Hjorth, Maria, Kabath, Petr ORCID: 0000-0002-1623-5352, Knudstrup, Emil ORCID: 0000-0001-7880-594X, Korth, Judith ORCID: 0000-0002-0076-6239, Li, Jie, Luque, Rafael ORCID: 0000-0002-4671-2957, Mathur, Savita, Montanes Rodriguez, Pilar, Narita, Norio, Nespral, David, Niraula, Prajwal, Nowak, Grzegorz, Palle, Enric, Paetzold, Martin, Prieto-Arranz, Jorge, Rauer, Heike, Redfield, Seth, Ribas, Ignasi ORCID: 0000-0002-6689-0312, Skarka, Marek ORCID: 0000-0002-7602-0046, Smith, Alexis M. S., Rowden, Pamela ORCID: 0000-0002-4829-7101, Torres, Guillermo, Van Eylen, Vincent ORCID: 0000-0001-5542-8870 and Vezie, Michael L. (2019). The Transiting Multi-planet System HD15337: Two Nearly Equal-mass Planets Straddling the Radius Gap. Astrophys. J. Lett., 876 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 2041-8213

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Abstract

We report the discovery of a super-Earth and a sub-Neptune transiting the star HD 15337 (TOI-402, TIC 120896927), a bright (V = 9) K1 dwarf observed by the Transiting Exoplanet Survey Satellite (TESS) in Sectors 3 and 4. We combine the TESS photometry with archival High Accuracy Radial velocity Planet Searcher spectra to confirm the planetary nature of the transit signals and derive the masses of the two transiting planets. With an orbital period of 4.8 days, a mass of 7.51(-1.01)(+1.09) M-circle plus and a radius of 1.64 +/- 0.06 R-circle plus, HD 15337 b joins the growing group of short-period super-Earths known to have a rocky terrestrial composition. The sub-Neptune HD 15337 c has an orbital period of 17.2 days, a mass of 8.11(-1.69)(+1.82) M-circle plus, and a radius of 2.39 +/- 0.12 R-circle plus, suggesting that the planet might be surrounded by a thick atmospheric envelope. The two planets have similar masses and lie on opposite sides of the radius gap, and are thus an excellent testbed for planet formation and evolution theories. Assuming that HD 15337 c hosts a hydrogen-dominated envelope, we employ a recently developed planet atmospheric evolution algorithm in a Bayesian framework to estimate the history of the high-energy (extreme ultraviolet and X-ray) emission of the host star. We find that at an age of 150 Myr, the star possessed on average between 3.7 and 127 times the high-energy luminosity of the current Sun.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Gandolfi, DavideUNSPECIFIEDorcid.org/0000-0001-8627-9628UNSPECIFIED
Fossati, LucaUNSPECIFIEDorcid.org/0000-0003-4426-9530UNSPECIFIED
Livingston, John H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stassun, Keivan G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grziwa, SaschaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barragan, OscarUNSPECIFIEDorcid.org/0000-0003-0563-0493UNSPECIFIED
Fridlund, MalcolmUNSPECIFIEDorcid.org/0000-0002-0855-8426UNSPECIFIED
Kubyshkina, DariaUNSPECIFIEDorcid.org/0000-0001-9137-9818UNSPECIFIED
Persson, Carina M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dai, FeiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lam, Kristine W. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Albrecht, SimonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Batalha, NatalieUNSPECIFIEDorcid.org/0000-0002-7030-9519UNSPECIFIED
Beck, Paul G.UNSPECIFIEDorcid.org/0000-0003-4745-2242UNSPECIFIED
Justesen, Anders BoUNSPECIFIEDorcid.org/0000-0002-0174-2466UNSPECIFIED
Cabrera, JuanUNSPECIFIEDorcid.org/0000-0001-6653-5487UNSPECIFIED
Cartwright, ScottUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cochran, William D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csizmadia, SzilardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Davies, Misty D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, Hans J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eigmueller, PhilippUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Endl, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, AndersUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Esposito, MassimilianoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garcia, Rafael A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goeke, RobertUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gonzalez-Cuesta, LuciaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, Eike W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatzes, Artie P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hidalgo, DiegoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirano, TeruyukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hjorth, MariaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kabath, PetrUNSPECIFIEDorcid.org/0000-0002-1623-5352UNSPECIFIED
Knudstrup, EmilUNSPECIFIEDorcid.org/0000-0001-7880-594XUNSPECIFIED
Korth, JudithUNSPECIFIEDorcid.org/0000-0002-0076-6239UNSPECIFIED
Li, JieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Luque, RafaelUNSPECIFIEDorcid.org/0000-0002-4671-2957UNSPECIFIED
Mathur, SavitaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montanes Rodriguez, PilarUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Narita, NorioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nespral, DavidUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Niraula, PrajwalUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nowak, GrzegorzUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palle, EnricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Prieto-Arranz, JorgeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, HeikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Redfield, SethUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ribas, IgnasiUNSPECIFIEDorcid.org/0000-0002-6689-0312UNSPECIFIED
Skarka, MarekUNSPECIFIEDorcid.org/0000-0002-7602-0046UNSPECIFIED
Smith, Alexis M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rowden, PamelaUNSPECIFIEDorcid.org/0000-0002-4829-7101UNSPECIFIED
Torres, GuillermoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van Eylen, VincentUNSPECIFIEDorcid.org/0000-0001-5542-8870UNSPECIFIED
Vezie, Michael L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-148372
DOI: 10.3847/2041-8213/ab17d9
Journal or Publication Title: Astrophys. J. Lett.
Volume: 876
Number: 2
Date: 2019
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 2041-8213
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Externe Einrichtungen > An-Institute > Associated Institutes of the Faculty of Mathematics and Natural Sciences > Rhenish Institute for Environmental Research - RIU
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
COOL DWARF STARS; BALMER LINES; VELOCITY; ROTATION; SEARCHMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/14837

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