Results 51 to 60 of about 100 (99)

Exoplanets and brown dwarfs detections through gravitational microlensing. Study of interferometric observations

, 2015
L'effet de microlentille gravitationnelle est devenu un outil unique pour détecter des exoplanètes. Il se produit lorsqu'une étoile de premier plan (la microlentille) et une étoile d'arrière plan (la source) sont alignées avec la Terre. La lumière provenant de l'étoile la plus lointaine, souvent dans le bulbe galactique, est alors déviée par la ...
openaire   +1 more source

Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey. III. Detectability of Giant Exomoons of Wide-separation Giant Planets

The Astronomical Journal
The Nancy Grace Roman Space Telescope (Roman) will conduct a Galactic Exoplanet Survey to discover bound and free-floating exoplanets using gravitational microlensing. Roman should be sensitive to lenses with mass down to ∼0.02 M _⊕ , or roughly the mass
Matthew Lastovka, B. Scott Gaudi, Samson A. Johnson, Matthew T. Penny, Eamonn Kerins, Nicholas J. Rattenbury   +5 more
doaj   +1 more source

Simulating Gravitational Microlensing Events by TESS: Predictions on Statistics and Properties

The Astronomical Journal
We study the statistics and properties of microlensing events that can be detected by the Transiting Exoplanet Survey Satellite (TESS) based on Monte Carlo simulations. We simulate potential microlensing events from a sample of TESS Candidate Target List
Sedighe Sajadian, Atousa Kalantari, Hossein Fatheddin, Somayeh Khakpash   +3 more
doaj   +1 more source

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

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

The Habitability of the Galactic Bulge. [PDF]

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

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

Prospects for Reconstructing the Free-floating Planet Mass Function at the Population Level with the Nancy Grace Roman Space Telescope

The Astronomical Journal
Free-floating planets comprise one of the most enigmatic populations of exoplanets in the Galaxy. Though ground-based observations point to a large abundance of these worlds, little is known about their origins and demographics.
William DeRocco, Samson A. Johnson, Farzaneh Zohrabi, Matthew T. Penny, Peter McGill   +4 more
doaj   +1 more source

The Persistent Missing Mass Problem in Planet Formation

The Astrophysical Journal Letters
Recent ground-based microlensing surveys suggest that our Galaxy may abound with small free-floating planets, potentially up to ∼21 such planets per star. We explore the implication of such possibility on the mass budget for planet formation.
Eve J. Lee, William DeRocco, Sam Hadden, B. Scott Gaudi   +3 more
doaj   +1 more source