Poster Open Access

Large Adaptive optics Survey for Substellar Objects (LASSO) at wide separations around young, nearby, low-mass stars with Robo-AO

Salama, Maissa; Ou, James; Baranec, Christoph; Liu, Michael C.; Bowler, Brendan P.; Barnes, Paul; Bonnet, Morgan; Chun, Mark; Duev, Dmitry; Goebel, Sean; Hall, Don; Jacobson, Shane; Jensen-Clem, Rebecca; Law, Nicholas M.; Lockhart, Charles; Riddle, Reed; Situ, Heather; Warmbier, Eric

Editor(s)
Wolk, Scott

The purpose of the Large Adaptive optics Survey for Substellar Objects (LASSO) is to directly image new substellar companions (<70 MJup) at wide orbital separations (\(\gtrsim\)50 AU) around young (\(\lesssim\)300 Myrs), nearby (<100 pc), low-mass (0.1-0.8 MSun) stars. We report on 427 young stars imaged in the visible (i') and near-infrared (J or H) simultaneously with Robo-AO on the Kitt Peak 2.1-m telescope and later the Maunakea UH 2.2-m telescope. To undertake the observations, we commissioned a new infrared camera on Robo-AO that uses a low-noise high-speed SAPHIRA detector. We detected 122 companion candidates around 110 stars, of which 58 companions are physically associated based on Gaia DR2 parallaxes and proper motions, another 52 require follow-up observations to confirm physical association, and 12 are background objects. The majority of confirmed and pending candidates are stellar companions, with ~5 being potentially substellar and requiring follow-up observations for confirmation. We also detected a 43\(\pm\)9 MJup and an 81\(\pm\)5 MJup companion that were previously reported. The companion separations range from 2-1112 AU and reach contrast ratios of 7.7 magnitudes in the near infrared compared to the primary. We found 34 of our targets have acceleration measurements derived from Hipparcos-Gaia proper motions. Of those, 58% of the 12 stars with companion candidates have significant accelerations (\(\chi\)2 >11.8), while only 23% of the remaining 22 stars with no detected companion have significant accelerations. The significance of the acceleration decreases with increasing companion separation. These young accelerating low-mass stars with companions will eventually yield dynamical masses with future orbit monitoring.

Files (13.3 MB)
Name Size
Salama_poster_CoolStars20half.pdf
md5:c6bc18e3d546c12ae6a75b9c36393463
12.2 MB Download
Salama_poster_CoolStars20half.png
md5:2a5d62ce3fbbdedc7d8aebf3a61ba5e3
1.1 MB Download
  • Bowler, B. P., & Nielsen, E. L. 2018, Occurrence Rates from Direct Imaging Surveys, ed. H. J. Deeg & J. A. Belmonte, 155, doi: 10.1007/978-3-319-55333-7_155

  • Muirhead, P. S., Dressing, C. D., Mann, A. W., et al. 2018, AJ, 155, 180, doi: 10.3847/1538-3881/aab710

  • Rodriguez, D. R., Zuckerman, B., Kastner, J. H., et al. 2013, ApJ, 774, 101, doi: 10.1088/0004-637X/774/2/101

  • Baranec, C., Riddle, R., Law, N. M., et al. 2014, ApJL, 790, L8

  • Finger, G., Baker, I., Alvarez, D., et al. 2014, in Proc. SPIE, Vol. 9148, Adaptive Optics Systems IV, 914817

  • Bonavita, M., Chauvin, G., Desidera, S., et al. 2012, A&A, 537, A67

  • Finger, G., Baker, I., Alvarez, D., et al. 2014, in Proc. SPIE, Vol. 9148, Adaptive Optics Systems IV, 914817

  • Kraus, A. L., & Hillenbrand, L. A. 2007, AJ, 134, 2340.

  • Chabrier, G., Baraffe, I., Allard, F., & Hauschildt, P. 2000, ApJ, 542, 464

  • Baraffe, I., Homeier, D., Allard, F., & Chabrier, G. 2015, A&A, 577, A42

  • Brandt, T. D. 2018, ApJS, 239, 31

  • Bowler, B. P., Shkolnik, E. L., Liu, M. C., et al. 2015, ApJ, 806, 62

79
63
views
downloads
All versions This version
Views 7979
Downloads 6363
Data volume 756.7 MB756.7 MB
Unique views 6666
Unique downloads 5454

Share

Cite as