TY - JOUR
T1 - The Gemini NICI Planet-Finding Campaign
T2 - The Frequency of Planets around Young Moving Group Stars
AU - A. Biller, Beth
AU - C. Liu, Michael
AU - Wahhaj, Zahed
AU - L. Nielsen, Eric
AU - L. Hayward, Thomas
AU - R. Males, Jared
AU - Skemer, Andrew
AU - M. Close, Laird
AU - Chun, Mark
AU - Ftaclas, Christ
AU - Clarke, Fraser
AU - Thatte, Niranjan
AU - L. Shkolnik, Evgenya
AU - Neill Reid, I.
AU - Hartung, Markus
AU - Boss, Alan
AU - Lin, Douglas
AU - H. P. Alencar, Silvia
AU - de Gouveia Dal Pino, Elisabete
AU - Gregorio-Hetem, Jane
AU - Toomey, Douglas
N1 - 96 pages, 23 figures, accepted for publication in ApJ
PY - 2013/9/5
Y1 - 2013/9/5
N2 - We report results of a direct imaging survey for giant planets around 80 members of the Beta 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 \Delta H=13.9 mag at 1" in combined CH4 narrowband ADI+SDI mode and median contrasts of \Delta H=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 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 MJup, 16.4+-1.0 AU, Biller et al. 2010), CD -35 2722B (31+-8 MJup, 67+-4 AU, Wahhaj et al. 2011), HD 12894B (0.46+-0.08 MSun, 15.7+-1.0 AU), and BD+07 1919C (0.20+-0.03 MSun, 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 MJup companions at semi-major axes from 10--150 AU to
AB - We report results of a direct imaging survey for giant planets around 80 members of the Beta 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 \Delta H=13.9 mag at 1" in combined CH4 narrowband ADI+SDI mode and median contrasts of \Delta H=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 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 MJup, 16.4+-1.0 AU, Biller et al. 2010), CD -35 2722B (31+-8 MJup, 67+-4 AU, Wahhaj et al. 2011), HD 12894B (0.46+-0.08 MSun, 15.7+-1.0 AU), and BD+07 1919C (0.20+-0.03 MSun, 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 MJup companions at semi-major axes from 10--150 AU to
KW - astro-ph.EP
U2 - 10.1088/0004-637X/777/2/160
DO - 10.1088/0004-637X/777/2/160
M3 - Article
SN - 0004-637X
VL - 777
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 160
ER -