TY - JOUR
T1 - THE gemini/nici planet-finding campaign
T2 - The frequency of planets around young moving group stars
AU - Biller, Beth A.
AU - Liu, Michael C.
AU - Wahhaj, Zahed
AU - Nielsen, Eric L.
AU - Hayward, Thomas L.
AU - Males, Jared R.
AU - Skemer, Andrew
AU - Close, Laird M.
AU - Chun, Mark
AU - Ftaclas, Christ
AU - Clarke, Fraser
AU - Thatte, Niranjan
AU - Shkolnik, Evgenya L.
AU - Reid, I. Neill
AU - Hartung, Markus
AU - Boss, Alan
AU - Lin, Douglas
AU - Alencar, Silvia H.P.
AU - De Gouveia Dal Pino, Elisabete
AU - Gregorio-Hetem, Jane
AU - Toomey, Douglas
PY - 2013/11/10
Y1 - 2013/11/10
N2 - We report results of a direct imaging survey for giant planets around 80 members of the β Pic, TW Hya, Tucana-Horologium, AB Dor, and Hercules-Lyra moving groups, observed as part of the Gemini/NICI Planet-Finding Campaign. For this sample, we obtained median contrasts of ΔH = 13.9 mag at 1″ in combined CH4 narrowband ADI+SDI mode and median contrasts of ΔH = 15.1 mag at 2″ in H-band ADI mode. We found numerous (>70) candidate companions in our survey images. Some of these candidates were rejected as common-proper motion companions using archival data; we reobserved with Near-Infrared Coronagraphic Imager (NICI) all other candidates that lay within 400 AU of the star and were not in dense stellar fields. The vast majority of candidate companions were confirmed as background objects from archival observations and/or dedicated NICI Campaign followup. Four co-moving companions of brown dwarf or stellar mass were discovered in this moving group sample: PZ Tel B (36 ± 6 M Jup, 16.4 ± 1.0 AU), CD-35 2722B (31 ± 8 M Jup, 67 ± 4 AU), HD 12894B (0.46 ± 0.08 M , 15.7 ± 1.0 AU), and BD+07 1919C (0.20 ± 0.03 M , 12.5 ± 1.4 AU). From a Bayesian analysis of the achieved H band ADI and ASDI contrasts, using power-law models of planet distributions and hot-start evolutionary models, we restrict the frequency of 1-20 M Jup companions at semi-major axes from 10-150 AU to <18% at a 95.4% confidence level using DUSTY models and to <6% at a 95.4% using COND models. Our results strongly constrain the frequency of planets within semi-major axes of 50 AU as well. We restrict the frequency of 1-20 M Jup companions at semi-major axes from 10-50 AU to <21% at a 95.4% confidence level using DUSTY models and to <7% at a 95.4% using COND models. This survey is the deepest search to date for giant planets around young moving group stars.
AB - We report results of a direct imaging survey for giant planets around 80 members of the β Pic, TW Hya, Tucana-Horologium, AB Dor, and Hercules-Lyra moving groups, observed as part of the Gemini/NICI Planet-Finding Campaign. For this sample, we obtained median contrasts of ΔH = 13.9 mag at 1″ in combined CH4 narrowband ADI+SDI mode and median contrasts of ΔH = 15.1 mag at 2″ in H-band ADI mode. We found numerous (>70) candidate companions in our survey images. Some of these candidates were rejected as common-proper motion companions using archival data; we reobserved with Near-Infrared Coronagraphic Imager (NICI) all other candidates that lay within 400 AU of the star and were not in dense stellar fields. The vast majority of candidate companions were confirmed as background objects from archival observations and/or dedicated NICI Campaign followup. Four co-moving companions of brown dwarf or stellar mass were discovered in this moving group sample: PZ Tel B (36 ± 6 M Jup, 16.4 ± 1.0 AU), CD-35 2722B (31 ± 8 M Jup, 67 ± 4 AU), HD 12894B (0.46 ± 0.08 M , 15.7 ± 1.0 AU), and BD+07 1919C (0.20 ± 0.03 M , 12.5 ± 1.4 AU). From a Bayesian analysis of the achieved H band ADI and ASDI contrasts, using power-law models of planet distributions and hot-start evolutionary models, we restrict the frequency of 1-20 M Jup companions at semi-major axes from 10-150 AU to <18% at a 95.4% confidence level using DUSTY models and to <6% at a 95.4% using COND models. Our results strongly constrain the frequency of planets within semi-major axes of 50 AU as well. We restrict the frequency of 1-20 M Jup companions at semi-major axes from 10-50 AU to <21% at a 95.4% confidence level using DUSTY models and to <7% at a 95.4% using COND models. This survey is the deepest search to date for giant planets around young moving group stars.
KW - binaries: close
KW - brown dwarfs
KW - planetary systems
KW - planets and satellites: detection
KW - stars: late-type
UR - http://www.scopus.com/inward/record.url?scp=84886844335&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84886844335&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/777/2/160
DO - 10.1088/0004-637X/777/2/160
M3 - Article
AN - SCOPUS:84886844335
SN - 0004-637X
VL - 777
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 160
ER -