The Transiting Multi-planet System HD15337: Two Nearly Equal-mass Planets Straddling the Radius Gap
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00111913" target="_blank" >RIV/00216224:14310/19:00111913 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.3847/2041-8213/ab17d9/meta" target="_blank" >https://iopscience.iop.org/article/10.3847/2041-8213/ab17d9/meta</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/2041-8213/ab17d9" target="_blank" >10.3847/2041-8213/ab17d9</a>
Alternative languages
Result language
angličtina
Original language name
The Transiting Multi-planet System HD15337: Two Nearly Equal-mass Planets Straddling the Radius Gap
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/EF16_027%2F0008360" target="_blank" >EF16_027/0008360: Postdoc@MUNI</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ASTROPHYSICAL JOURNAL LETTERS
ISSN
2041-8205
e-ISSN
2041-8213
Volume of the periodical
876
Issue of the periodical within the volume
2
Country of publishing house
GB - UNITED KINGDOM
Number of pages
12
Pages from-to
1-12
UT code for WoS article
000467116000007
EID of the result in the Scopus database
2-s2.0-85067310082