Precise mass determination for the keystone sub-Neptune planet transiting the mid-type M dwarf G 9-40
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F22%3A00563701" target="_blank" >RIV/67985815:_____/22:00563701 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0337575" target="_blank" >https://hdl.handle.net/11104/0337575</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202244426" target="_blank" >10.1051/0004-6361/202244426</a>
Alternative languages
Result language
angličtina
Original language name
Precise mass determination for the keystone sub-Neptune planet transiting the mid-type M dwarf G 9-40
Original language description
For planets orbiting bright stars, precisely measuring the orbital and planet parameters of the system is the best approach to distinguish between competing theories regarding their formation and evolution. We obtained 69 new radial velocity observations of the mid-M dwarf G 9-40 with the CARMENES instrument to measure for the first time the mass of its transiting sub-Neptune planet, G 9-40 b, discovered in data from the K2 mission. Combined with new observations from the TESS mission during Sectors 44, 45, and 46, we are able to measure the radius of the planet to an uncertainty of 3.4% (R-b = 1.900 +/- 0.065 R-circle plus) and determine its mass with a precision of 16% (M-b = 4.00 +/- 0.63 M-circle plus). The resulting bulk density of the planet is inconsistent with a terrestrial composition and suggests the presence of either a water-rich core or a significant hydrogen-rich envelope.
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
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
666
Issue of the periodical within the volume
October
Country of publishing house
FR - FRANCE
Number of pages
15
Pages from-to
A154
UT code for WoS article
000870824900008
EID of the result in the Scopus database
2-s2.0-85149118366