A temperate exo-Earth around a quiet M dwarf at 3.4 parsec

The combination of high-contrast imaging and high-dispersion spectroscopy, which has successfully been use to detect the atmosphere of a giant planet, is one of the most promising potential probes of the atmosphere of Earth-size worlds. The forthcoming generation of extremely large telescopes (ELTs)...

Descripción completa

Guardado en:

Detalles Bibliográficos
Publicado:	2018
Materias:	Planetary systems stars: late-Type techniques: radial velocities Earth atmosphere Photometry Planets Solar radiation Stars Surveys Angular separation Extremely Large Telescopes High contrast imaging Magnetic activity Planetary system Radial-velocity observations Stars:late type Techniques: radial velocities Orbits
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v613_n_p_Bonfils http://hdl.handle.net/20.500.12110/paper_00046361_v613_n_p_Bonfils
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00046361_v613_n_p_Bonfils
record_format	dspace
spelling	paper:paper_00046361_v613_n_p_Bonfils2023-06-08T14:28:23Z A temperate exo-Earth around a quiet M dwarf at 3.4 parsec Planetary systems stars: late-Type techniques: radial velocities Earth atmosphere Photometry Planets Solar radiation Stars Surveys Angular separation Extremely Large Telescopes High contrast imaging Magnetic activity Planetary system Radial-velocity observations Stars:late type Techniques: radial velocities Orbits The combination of high-contrast imaging and high-dispersion spectroscopy, which has successfully been use to detect the atmosphere of a giant planet, is one of the most promising potential probes of the atmosphere of Earth-size worlds. The forthcoming generation of extremely large telescopes (ELTs) may obtain sufficient contrast with this technique to detect O 2 in the atmosphere of those worlds that orbit low-mass M dwarfs. This is strong motivation to carry out a census of planets around cool stars for which habitable zones can be resolved by ELTs, i.e. for M dwarfs within ~5 parsec. Our HARPS survey has been a major contributor to that sample of nearby planets. Here we report on our radial velocity observations of Ross 128 (Proxima Virginis, GJ447, HIP 57548), an M4 dwarf just 3.4 parsec away from our Sun. This source hosts an exo-Earth with a projected mass m sini = 1.35 M and an orbital period of 9.9 days. Ross 128 b receives less than 1.5 times as much flux as Earth from the Sun and its equilibrium ranges in temperature between 269 K for an Earth-like albedo and 213 K for a Venus-like albedo. Recent studies place it close to the inner edge of the conventional habitable zone. An 80-day long light curve from K2 campaign C01 demonstrates that Ross 128 b does not transit. Together with the All Sky Automated Survey (ASAS) photometry and spectroscopic activity indices, the K2 photometry shows that Ross 128 rotates slowly and has weak magnetic activity. In a habitability context, this makes survival of its atmosphere against erosion more likely. Ross 128 b is the second closest known exo-Earth, after Proxima Centauri b (1.3 parsec), and the closest temperate planet known around a quiet star. The 15 mas planet-star angular separation at maximum elongation will be resolved by ELTs (>3λD) in the optical bands of O 2 . © ESO 2018. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v613_n_p_Bonfils http://hdl.handle.net/20.500.12110/paper_00046361_v613_n_p_Bonfils
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Planetary systems stars: late-Type techniques: radial velocities Earth atmosphere Photometry Planets Solar radiation Stars Surveys Angular separation Extremely Large Telescopes High contrast imaging Magnetic activity Planetary system Radial-velocity observations Stars:late type Techniques: radial velocities Orbits
spellingShingle	Planetary systems stars: late-Type techniques: radial velocities Earth atmosphere Photometry Planets Solar radiation Stars Surveys Angular separation Extremely Large Telescopes High contrast imaging Magnetic activity Planetary system Radial-velocity observations Stars:late type Techniques: radial velocities Orbits A temperate exo-Earth around a quiet M dwarf at 3.4 parsec
topic_facet	Planetary systems stars: late-Type techniques: radial velocities Earth atmosphere Photometry Planets Solar radiation Stars Surveys Angular separation Extremely Large Telescopes High contrast imaging Magnetic activity Planetary system Radial-velocity observations Stars:late type Techniques: radial velocities Orbits
description	The combination of high-contrast imaging and high-dispersion spectroscopy, which has successfully been use to detect the atmosphere of a giant planet, is one of the most promising potential probes of the atmosphere of Earth-size worlds. The forthcoming generation of extremely large telescopes (ELTs) may obtain sufficient contrast with this technique to detect O 2 in the atmosphere of those worlds that orbit low-mass M dwarfs. This is strong motivation to carry out a census of planets around cool stars for which habitable zones can be resolved by ELTs, i.e. for M dwarfs within ~5 parsec. Our HARPS survey has been a major contributor to that sample of nearby planets. Here we report on our radial velocity observations of Ross 128 (Proxima Virginis, GJ447, HIP 57548), an M4 dwarf just 3.4 parsec away from our Sun. This source hosts an exo-Earth with a projected mass m sini = 1.35 M and an orbital period of 9.9 days. Ross 128 b receives less than 1.5 times as much flux as Earth from the Sun and its equilibrium ranges in temperature between 269 K for an Earth-like albedo and 213 K for a Venus-like albedo. Recent studies place it close to the inner edge of the conventional habitable zone. An 80-day long light curve from K2 campaign C01 demonstrates that Ross 128 b does not transit. Together with the All Sky Automated Survey (ASAS) photometry and spectroscopic activity indices, the K2 photometry shows that Ross 128 rotates slowly and has weak magnetic activity. In a habitability context, this makes survival of its atmosphere against erosion more likely. Ross 128 b is the second closest known exo-Earth, after Proxima Centauri b (1.3 parsec), and the closest temperate planet known around a quiet star. The 15 mas planet-star angular separation at maximum elongation will be resolved by ELTs (>3λD) in the optical bands of O 2 . © ESO 2018.
title	A temperate exo-Earth around a quiet M dwarf at 3.4 parsec
title_short	A temperate exo-Earth around a quiet M dwarf at 3.4 parsec
title_full	A temperate exo-Earth around a quiet M dwarf at 3.4 parsec
title_fullStr	A temperate exo-Earth around a quiet M dwarf at 3.4 parsec
title_full_unstemmed	A temperate exo-Earth around a quiet M dwarf at 3.4 parsec
title_sort	temperate exo-earth around a quiet m dwarf at 3.4 parsec
publishDate	2018
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v613_n_p_Bonfils http://hdl.handle.net/20.500.12110/paper_00046361_v613_n_p_Bonfils
_version_	1768544390802833408

A temperate exo-Earth around a quiet M dwarf at 3.4 parsec

Ejemplares similares