THE GEMINI NICI PLANET-FINDING CAMPAIGN: DISCOVERY OF A MULTIPLE SYSTEM ORBITING THE YOUNG A STAR HD 1160


Autoria(s): Nielsen, Eric L.; Liu, Michael C.; Wahhaj, Zahed; Biller, Beth A.; Hayward, Thomas L.; Boss, Alan; Bowler, Brendan; Kraus, Adam; Shkolnik, Evgenya L.; Tecza, Matthias; Chun, Mark; Clarke, Fraser; Close, Laird M.; Ftaclas, Christ; Hartung, Markus; Males, Jared R.; Reid, I. Neill; Skemer, Andrew J.; Alencar, Silvia H. P.; Burrows, Adam; Dal Pino, Elisabethe de Gouveia; Gregorio-Hetem, Jane; Kuchner, Marc; Thatte, Niranjan; Toomey, Douglas W.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

05/11/2013

05/11/2013

2012

Resumo

We report the discovery of two low-mass companions to the young A0V star HD 1160 at projected separations of 81 +/- 5 AU (HD 1160 B) and 533 +/- 25 AU (HD 1160 C) by the Gemini NICI Planet-Finding Campaign. Very Large Telescope images of the system taken over a decade for the purpose of using HD 1160 A as a photometric calibrator confirm that both companions are physically associated. By comparing the system to members of young moving groups and open clusters with well-established ages, we estimate an age of 50(-40)(+50) Myr for HD 1160 ABC. While the UVW motion of the system does not match any known moving group, the small magnitude of the space velocity is consistent with youth. Near-IR spectroscopy shows HD 1160 C to be an M3.5 +/- 0.5 star with an estimated mass of 0.22(-0.04)(+0.03) M-circle dot, while NIR photometry of HD 1160 B suggests a brown dwarf with a mass of 33(-9)(+12) M-Jup. The very small mass ratio (0.014) between the A and B components of the system is rare for A star binaries, and would represent a planetary-mass companion were HD 1160 A to be slightly less massive than the Sun.

Space Telescope Science Institute

Space Telescope Science Institute [HST-HF-01204.01-A]

National Aeronautics and Space Administration

National Aeronautics and Space Administration [NAS 5-26555]

National Science Foundation [AST-0713881, AST-0709484]

National Science Foundation

Identificador

ASTROPHYSICAL JOURNAL, BRISTOL, v. 750, n. 1, supl. 1, Part 6, pp. 156-165, MAY, 2012

0004-637X

http://www.producao.usp.br/handle/BDPI/41856

10.1088/0004-637X/750/1/53

http://dx.doi.org/10.1088/0004-637X/750/1/53

Idioma(s)

eng

Publicador

IOP PUBLISHING LTD

BRISTOL

Relação

ASTROPHYSICAL JOURNAL

Direitos

closedAccess

Copyright IOP PUBLISHING LTD

Palavras-Chave #BROWN DWARFS #INSTRUMENTATION: ADAPTIVE OPTICS #PLANETARY SYSTEMS #PLANETS AND SATELLITES: DETECTION #STARS: INDIVIDUAL (HD 1160) #LOW-MASS STARS #CANDIDATE SUBSTELLAR COMPANION #SPECTRAL ENERGY-DISTRIBUTIONS #EXTRASOLAR GIANT PLANETS #BROWN DWARF COMPANION #NEAR-INFRARED SPECTRA #HR 8799 #ADAPTIVE OPTICS #STANDARD STARS #MIDINFRARED PHOTOMETRY #ASTRONOMY & ASTROPHYSICS
Tipo

article

original article

publishedVersion