Downloads provided by UsageCountsTESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906
Copyright policy )SNSF| NCCR PlanetS: Origin, evolution and characterisation of planets (phase III) ,
EC| FIERCE ,
NSF| Pan-STARRS1: Operations; Public Data Release; Education and Outreach ,
EC| FOUR ACES ,
UKRI| Astrophysics at Keele: planets, stars and galaxies. ,
SNSF| TITANIA: TIme variabiliTy As a New window on exoplanet clImAtes ,
SNSF| Spectroscopy of hot twilights in exoplanetary atmospheres ,
UKRI| Astronomy at St Andrews 2021 - 2024 ,
UKRI| Astronomy at St Andrews 2018-2021 ,
SNSF| NCCR PlanetS: Origin, evolution and characterisation of planets (phase II)
A Tuson; D Queloz; H P Osborn; T G Wilson; M J Hooton; M Beck; M Lendl; G Olofsson; A Fortier; A Bonfanti; A Brandeker; L A Buchhave; A Collier Cameron; D R Ciardi; K A Collins; D Gandolfi; Z Garai; S Giacalone; J Gomes da Silva; S B Howell; J A Patel; C M Persson; L M Serrano; S G Sousa; S Ulmer-Moll; A Vanderburg; C Ziegler; Y Alibert; R Alonso; G Anglada; T Bárczy; D Barrado Navascues; S C C Barros; W Baumjohann; T Beck; W Benz; N Billot; X Bonfils; L Borsato; C Broeg; J Cabrera; S Charnoz; D M Conti; Sz Csizmadia; P E Cubillos; M B Davies; M Deleuil; L Delrez; O D S Demangeon; B-O Demory; D Dragomir; C D Dressing; D Ehrenreich; A Erikson; Z Essack; J Farinato; L Fossati; M Fridlund; E Furlan; H Gill; M Gillon; C L Gnilka; E Gonzales; M Güdel; M N Günther; S Hoyer; K G Isaak; J M Jenkins; L L Kiss; J Laskar; D W Latham; N Law; A Lecavelier des Etangs; G Lo Curto; C Lovis; R Luque; D Magrin; A W Mann; P F L Maxted; M Mayor; S McDermott; M Mecina; C Mordasini; A Mortier; V Nascimbeni; R Ottensamer; I Pagano; E Pallé; G Peter; G Piotto; D Pollacco; T Pritchard; R Ragazzoni; N Rando; F Ratti; H Rauer; I Ribas; G R Ricker; M Rieder; N C Santos; A B Savel; G Scandariato; R P Schwarz; S Seager; D Ségransan; A Shporer; A E Simon; A M S Smith; M Steller; C Stockdale; Gy M Szabó; N Thomas; G Torres; R Tronsgaard; S Udry; B Ulmer; V Van Grootel; R Vanderspek; J Venturini; N A Walton; J N Winn; B Wohler;
TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906
ABSTRACT We report the discovery of two warm sub-Neptunes transiting the bright (G = 9.5 mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by the Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing two small transiting planets. The inner planet, HD 15906 b, was detected with an unambiguous period but the outer planet, HD 15906 c, showed only two transits separated by ∼ 734 d, leading to 36 possible values of its period. We performed follow-up observations with the CHaracterising ExOPlanet Satellite (CHEOPS) to confirm the true period of HD 15906 c and improve the radius precision of the two planets. From TESS, CHEOPS, and additional ground-based photometry, we find that HD 15906 b has a radius of 2.24 ± 0.08 R⊕ and a period of 10.924709 ± 0.000032 d, whilst HD 15906 c has a radius of 2.93$^{+0.07}_{-0.06}$ R⊕ and a period of 21.583298$^{+0.000052}_{-0.000055}$ d. Assuming zero bond albedo and full day-night heat redistribution, the inner and outer planet have equilibrium temperatures of 668 ± 13 K and 532 ± 10 K, respectively. The HD 15906 system has become one of only six multiplanet systems with two warm (≲ 700 K) sub-Neptune sized planets transiting a bright star (G ≤ 10 mag). It is an excellent target for detailed characterization studies to constrain the composition of sub-Neptune planets and test theories of planet formation and evolution.
- University of Maryland, College Park United States
- Lund University Sweden
- Panthéon-Assas University France
- Grenoble Alpes University France
- University of Paris France
planets and satellites: detection, Aérospatiale, astronomie & astrophysique, 103003 Astronomie, Stars: individual: HD 15906, individual: HD 15906 (TOI 461, TIC 4646810) [Stars], Outer planets, techniques: photometric, 103038 Space exploration, TOI 461, QB Astronomy, Stars: individual: proxima Centauri, 103004 Astrophysics, planets and satellites: fundamental parameters, Stars: fundamental parameters, QB, Earth and Planetary Astrophysics (astro-ph.EP), 520 Astronomy, 500 Naturwissenschaften und Mathematik::520 Astronomie::520 Astronomie und zugeordnete Wissenschaften, Planets and satellites: detection, 103004 Astrophysik, 520, Planets and satellites: fundamental parameters, Star: individual: HD 15906 (TOI 461, TIC 4646810), Exo-planets, Neptune, stars: fundamental parameters, stars: individual: HD 15906 (TOI 461, TIC 4646810), Stars: Be, 530 Physics, Physique, chimie, mathématiques & sciences de la terre, fundamental parameters [Planets and satellites], TIC 4646810), FOS: Physical sciences, stars: individual: HD 15906 (TOI 461, TIC 4646810), 103038 Weltraumforschung, fundamental parameters [Stars], [SDU] Sciences of the Universe [physics], 103003 Astronomy, Physical, chemical, mathematical & earth Sciences, TIC 4646810, stars: individual: HD 15906 (TOI 461, MCC, Planets and satellites: detections, photometric [Techniques], 500, DAS, Astronomy and Astrophysics, 620 Engineering, planets and satellites: detection; planets and satellites: fundamental parameters; stars: fundamental parameters; stars: individual: HD 15906 (TOI 461, TIC 4646810); techniques: photometric, Stars:fundamental parameters, detection [Planets and satellites], [SDU]Sciences of the Universe [physics], Space and Planetary Science, astro-ph.EP, Space science, astronomy & astrophysics, Techniques: photometric, Astrophysics - Earth and Planetary Astrophysics
planets and satellites: detection, Aérospatiale, astronomie & astrophysique, 103003 Astronomie, Stars: individual: HD 15906, individual: HD 15906 (TOI 461, TIC 4646810) [Stars], Outer planets, techniques: photometric, 103038 Space exploration, TOI 461, QB Astronomy, Stars: individual: proxima Centauri, 103004 Astrophysics, planets and satellites: fundamental parameters, Stars: fundamental parameters, QB, Earth and Planetary Astrophysics (astro-ph.EP), 520 Astronomy, 500 Naturwissenschaften und Mathematik::520 Astronomie::520 Astronomie und zugeordnete Wissenschaften, Planets and satellites: detection, 103004 Astrophysik, 520, Planets and satellites: fundamental parameters, Star: individual: HD 15906 (TOI 461, TIC 4646810), Exo-planets, Neptune, stars: fundamental parameters, stars: individual: HD 15906 (TOI 461, TIC 4646810), Stars: Be, 530 Physics, Physique, chimie, mathématiques & sciences de la terre, fundamental parameters [Planets and satellites], TIC 4646810), FOS: Physical sciences, stars: individual: HD 15906 (TOI 461, TIC 4646810), 103038 Weltraumforschung, fundamental parameters [Stars], [SDU] Sciences of the Universe [physics], 103003 Astronomy, Physical, chemical, mathematical & earth Sciences, TIC 4646810, stars: individual: HD 15906 (TOI 461, MCC, Planets and satellites: detections, photometric [Techniques], 500, DAS, Astronomy and Astrophysics, 620 Engineering, planets and satellites: detection; planets and satellites: fundamental parameters; stars: fundamental parameters; stars: individual: HD 15906 (TOI 461, TIC 4646810); techniques: photometric, Stars:fundamental parameters, detection [Planets and satellites], [SDU]Sciences of the Universe [physics], Space and Planetary Science, astro-ph.EP, Space science, astronomy & astrophysics, Techniques: photometric, Astrophysics - Earth and Planetary Astrophysics
selected citations These citations are derived from selected sources.This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).12 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 10% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 10% views 29 downloads 27 - 29views27downloads
selected citations
Citations provided by BIP!
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
Citations provided by BIP!popularityPopularity provided by BIP!
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
Popularity provided by BIP!influenceInfluence provided by BIP!
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
Influence provided by BIP!impulseImpulse provided by BIP!
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
Impulse provided by BIP!viewsViews provided by UsageCounts
Views provided by UsageCountsdownloadsDownloads provided by UsageCounts
Downloads provided by UsageCounts 12
Top 10%
Average
Top 10%
29
27
Green
gold
