Skip to Main Content (Press Enter)

Logo UNITO
  • ×
  • Home
  • Pubblicazioni
  • Progetti
  • Persone
  • Competenze
  • Settori
  • Strutture
  • Terza Missione

UNI-FIND
Logo UNITO

|

UNI-FIND

unito.it
  • ×
  • Home
  • Pubblicazioni
  • Progetti
  • Persone
  • Competenze
  • Settori
  • Strutture
  • Terza Missione
  1. Pubblicazioni

K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths

Articolo
Data di Pubblicazione:
2018
Abstract:
We report on the discovery of three transiting super-Earths around K2-155 (EPIC 210897587), a relatively bright early M dwarf (V=12.81 mag) observed during Campaign 13 of the NASA K2 mission. To characterize the system and validate the planet candidates, we conducted speckle imaging and high-dispersion optical spectroscopy, including radial velocity measurements. Based on the K2 light curve and the spectroscopic characterization of the host star, the planet sizes and orbital periods are 1.55(+0.20)(−0.17)R⊕ and 6.34365±0.00028 days for the inner planet; 1.95(+0.27)(−0.22)R⊕ and 13.85402±0.00088 days for the middle planet; and 1.64(+0.18)(−0.17)R⊕ and 40.6835±0.0031 days for the outer planet. The outer planet (K2-155d) is near the habitable zone, with an insolation 1.67±0.38 times that of the Earth. The planet's radius falls within the range between that of smaller rocky planets and larger gas-rich planets. To assess the habitability of this planet, we present a series of 3D global climate simulations assuming that K2-155d is tidally locked and has an Earth-like composition and atmosphere. We find that the planet can maintain a moderate surface temperature if the insolation proves to be smaller than ∼1.5 times that of the Earth. Doppler mass measurements, transit spectroscopy, and other follow-up observations should be rewarding, since K2-155 is one of the optically brightest M dwarfs known to harbor transiting planets.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
planets and satellites: detection; stars: individual (K2-155 = EPIC 210897587); techniques: photometric; techniques: radial velocities; techniques: spectroscopic
Elenco autori:
Hirano T.; Dai F.; Livingston J.H.; Fujii Y.; Cochran W.D.; Endl M.; Gandolfi D.; Redfield S.; Winn J.N.; Guenther E.W.; Prieto-Arranz J.; Albrecht S.; Barragan O.; Cabrera J.; Cauley P.W.; Csizmadia S.; Deeg H.; Eigmuller P.; Erikson A.; Fridlund M.; Fukui A.; Grziwa S.; Hatzes A.P.; Korth J.; Narita N.; Nespral D.; Niraula P.; Nowak G.; Patzold M.; Palle E.; Persson C.M.; Rauer H.; Ribas I.; Smith A.M.S.; Eylen V.V.
Autori di Ateneo:
GANDOLFI Davide
Link alla scheda completa:
https://iris.unito.it/handle/2318/1711626
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1711626/532609/Hirano_2018.pdf
Pubblicato in:
THE ASTRONOMICAL JOURNAL
Journal
  • Dati Generali

Dati Generali

URL

http://iopscience.iop.org/article/10.3847/1538-3881/aaaa6e/pdf
  • Utilizzo dei cookie

Realizzato con VIVO | Designed by Cineca | 25.6.1.0