Results 1 to 10 of about 4,034,717 (373)
The JWST Early-release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 μm Spectrum of the Planetary-mass Companion VHS 1256–1257 b [PDF]
The Astrophysical Journal Letters, 2023 We present the highest fidelity spectrum to date of a planetary-mass object. VHS 1256 b is a
Brittany E. Miles +110 more
doaj +2 more sources
On the origin of planetary-mass objects in NGC 1333 [PDF]
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT The dominant formation mechanism of brown dwarfs and planetary-mass objects (PMOs) in star-forming regions is presently uncertain. Do they form like stars, via the collapse and fragmentation of cores in giant molecular clouds, or do they form like planets in the discs around stars and are ejected via dynamical interactions?
Richard J Parker +1 more
openaire +3 more sources
Obliquity Constraints on an Extrasolar Planetary-mass Companion [PDF]
The Astronomical Journal, 2020 Abstract We place the first constraints on the obliquity of a planetary-mass companion outside of the solar system. Our target is the directly imaged system 2MASS J01225093–2439505 (2M0122), which consists of a 120 Myr 0.4 M ⊙ star hosting a 12–27 M J companion at 50 au.
Marta L. Bryan +10 more
openaire +8 more sources
Estimating Planetary Mass with Deep Learning [PDF]
The Astronomical Journal, 2020 Abstract While thousands of exoplanets have been confirmed, the known properties about individual discoveries remain sparse and depend on detection technique. To utilize more than a small section of the exoplanet data set, tools need to be developed to estimate missing values based on the known measurements.
Elizabeth J. Tasker +2 more
openaire +5 more sources
Planetary mass–radius relations across the galaxy [PDF]
Astronomy & Astrophysics, 2020 Context. Planet formation theory suggests that planet bulk compositions are likely to reflect the chemical abundance ratios of their host star’s photosphere. Variations in the abundance of particular chemical species in stellar photospheres between different galactic stellar populations demonstrate that there are differences among the expected solid ...
J. Haldemann +4 more
openaire +5 more sources
A Methane, Isolated, Planetary‐Mass Object in Orion [PDF]
The Astrophysical Journal, 2002 Accepted for publication in the ApJ.
M. R. Zapatero Osorio +7 more
openalex +6 more sources
Spectroscopy of planetary mass brown dwarfs in Orion [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2006 Abstract We report the results of near infrared spectroscopy of 11 luminosity-selected candidate planetary mass objects (PMOs) in the Trapezium Cluster with Gemini South/Gemini Near-Infrared Spectrograph and Gemini North/Near-Infrared Imager. Six have spectral types ⩾M9, in agreement with expectations for PMOs.
P. W. Lucas +3 more
openalex +5 more sources
Searching for planetary-mass T-dwarfs in the core of Serpens [PDF]
Astronomy & Astrophysics, 2012 We searched for isolated planetary-mass T-dwarfs in the 3Myr old Serpens Core cluster. We performed a deep imaging survey of the central part of this cluster using the WIRCam camera at the CFHT. Observations were performed through the narrow-band CH4_off and CH4_on filters, to identify young T-dwarfs from their 1.6micr methane absorption bands, and the
L. Spezzi +7 more
openalex +6 more sources
JWST/NIRSpec Observations of the Planetary Mass Companion TWA 27B [PDF]
Astrophysical Journal Letters, 2023 We present 1–5 μm spectroscopy of the young planetary mass companion TWA 27B (2M1207B) performed with NIRSpec on board the James Webb Space Telescope. In these data, the fundamental band of CH4 is absent, and the fundamental band of CO is weak.
K. Luhman +10 more
semanticscholar +1 more source