TY - JOUR
T1 - The gemini NICI planet-finding campaign
T2 - Discovery of a multiple system orbiting the young A star HD1160
AU - Nielsen, Eric L.
AU - Liu, Michael C.
AU - Wahhaj, Zahed
AU - Biller, Beth A.
AU - Hayward, Thomas L.
AU - Boss, Alan
AU - Bowler, Brendan
AU - Kraus, Adam
AU - Shkolnik, Evgenya L.
AU - Tecza, Matthias
AU - Chun, Mark
AU - Clarke, Fraser
AU - Close, Laird M.
AU - Ftaclas, Christ
AU - Hartung, Markus
AU - Males, Jared R.
AU - Reid, I. Neill
AU - Skemer, Andrew J.
AU - Alencar, Silvia H.P.
AU - Burrows, Adam
AU - De Gouveia Dal Pino, Elisabethe
AU - Gregorio-Hetem, Jane
AU - Kuchner, Marc
AU - Thatte, Niranjan
AU - Toomey, Douglas W.
PY - 2012/5/1
Y1 - 2012/5/1
N2 - We report the discovery of two low-mass companions to the young A0V star HD1160 at projected separations of 81 ± 5AU (HD1160B) and 533 ± 25AU (HD1160C) by the Gemini NICI Planet-Finding Campaign. Very Large Telescope images of the system taken over a decade for the purpose of using HD1160A 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+50 -40Myr for HD1160 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 HD1160C to be an M3.5 ± 0.5 star with an estimated mass of 0.22+0.03 -0.04 M⊙, while NIR photometry of HD1160B suggests a brown dwarf with a mass of 33 +12 -9 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 HD1160A to be slightly less massive than the Sun.
AB - We report the discovery of two low-mass companions to the young A0V star HD1160 at projected separations of 81 ± 5AU (HD1160B) and 533 ± 25AU (HD1160C) by the Gemini NICI Planet-Finding Campaign. Very Large Telescope images of the system taken over a decade for the purpose of using HD1160A 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+50 -40Myr for HD1160 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 HD1160C to be an M3.5 ± 0.5 star with an estimated mass of 0.22+0.03 -0.04 M⊙, while NIR photometry of HD1160B suggests a brown dwarf with a mass of 33 +12 -9 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 HD1160A to be slightly less massive than the Sun.
KW - brown dwarfs
KW - instrumentation: adaptive optics
KW - planetary systems
KW - planets and satellites: detection
KW - stars: individual (HD 1160)
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U2 - 10.1088/0004-637X/750/1/53
DO - 10.1088/0004-637X/750/1/53
M3 - Article
AN - SCOPUS:84859890974
SN - 0004-637X
VL - 750
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 53
ER -