Results 41 to 50 of about 85 (84)

OGLE-2016-BLG-1195Lb: A Sub-Neptune Beyond the Snow Line of an M-dwarf Confirmed by Keck Adaptive Optics

The Astronomical Journal
We present the analysis of high-resolution follow-up observations of OGLE-2016-BLG-1195 using Laser Guide Star Adaptive Optics with Keck, seven years after the event’s peak.
Aikaterini Vandorou, Lisa Dang, David P. Bennett, Naoki Koshimoto, Sean K. Terry, Andrzej Udalski, Jean-Philippe Beaulieu, Christophe Alard, Aparna Bhattacharya, Joshua W. Blackman, Ian A. Bond, Tarik Bouchoutrouch-Ku, Andrew A. Cole, Nicolas B. Cowan, Jean-Baptiste Marquette, Clément Ranc, Natalia E. Rektsini, Sylvain Cetre, Jim Lyke, Eduardo Marin, Peter Wizinowich   +20 more
doaj   +1 more source

Subaru Telescope -History, active/adaptive optics, instruments, and scientific achievements. [PDF]

Proc Jpn Acad Ser B Phys Biol Sci, 2021
Iye M.
europepmc   +1 more source

The Brown-dwarf Desert Persists as a Mass-ratio Desert around Low-mass Stars

The Astrophysical Journal Letters
Sun-like stars are known to host a paucity of brown-dwarf companions at close separations. Direct imaging surveys of intermediate-mass stars have suggested that the brown-dwarf desert may be fundamentally a feature in the mass ratio. Microlensing surveys
Keming Zhang
doaj   +1 more source

Searching for Free-floating Planets with TESS: Results from Sectors 61–65

The Astronomical Journal
Though free-floating planets (FFPs) may outpopulate their bound counterparts in the terrestrial-mass range, they remain one of the least explored exoplanet demographics.
Michelle Kunimoto, William DeRocco, Nolan Smyth, Steve Bryson, B. Scott Gaudi   +4 more
doaj   +1 more source

Microlensing Constraints on the Stellar and Planetary Mass Functions

The Astronomical Journal
The mass function (MF) of isolated objects measured by microlensing consists of both a stellar and a planetary component. We compare the microlensing MFs of A. Gould et al. and T. Sumi et al. to other measurements of the MF. The abundance of brown dwarfs
Jennifer C. Yee, Scott J. Kenyon
doaj   +1 more source

Twinkle: A GPU-based Binary-lens Microlensing Code with the Contour Integration Method

The Astrophysical Journal Supplement Series
With the rapidly increasing rate of microlensing planet detections, microlensing modeling software faces significant challenges in computation efficiency.
Suwei Wang, Lile Wang, Subo Dong
doaj   +1 more source

The Habitability of the Galactic Bulge. [PDF]

Life (Basel), 2020
Balbi A, Hami M, Kovačević A.
europepmc   +1 more source

Dark Matter Genesis

The Astrophysical Journal
Recent discoveries of primordial black hole (PBH) candidates by means of high-cadence microlensing open the way to a physical understanding of the formation of dark matter as a chapter in the thermal history of the Universe.
Jeremy Mould
doaj   +1 more source

Keck and Hubble Observations Show that MOA-2008-BLG-379Lb is a Super-Jupiter Orbiting an M Dwarf

The Astronomical Journal
We present high angular resolution imaging that detects the MOA-2008-BLG-379L exoplanet host star using Keck adaptive optics and the Hubble Space Telescope.
David P. Bennett, Aparna Bhattacharya, Jean-Philippe Beaulieu, Naoki Koshimoto, Joshua W. Blackman, Ian A. Bond, Clément Ranc, Natalia Rektsini, Sean K. Terry, Aikaterini Vandorou, Jessica R. Lu, Jean Baptiste Marquette, Greg Olmschenk, Daisuke Suzuki   +13 more
doaj   +1 more source

Evolution of novel activation functions in neural network training for astronomy data: habitability classification of exoplanets. [PDF]

Eur Phys J Spec Top, 2020
Saha S, Nagaraj N, Mathur A, Yedida R, H R S.   +4 more
europepmc   +1 more source