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
Planetary-Mass Dark Matter? [PDF]
arXiv, 2001 Sahu et al. recently reported tentative evidence for a large population of "free-floating" planetary-mass objects in a nearby globular cluster. If verified, this discovery is consistent with a prediction that the galactic dark matter has a substantial planetary-mass component.
Robert L. Oldershaw
arxiv +3 more sources
Effects of Planetary Mass Uncertainties on the Interpretation of the Reflectance Spectra of Earth-like Exoplanets [PDF]
The Astronomical JournalAtmospheric characterization of Earth-like exoplanets through reflected light spectroscopy is a key goal for upcoming direct imaging missions. A critical challenge in this endeavor is the accurate determination of planetary mass, which may influence the ...
Mario Damiano +4 more
doaj +2 more sources
Enhanced Stability in Planetary Systems with Similar Masses [PDF]
The Astronomical JournalThis study employs numerical simulations to explore the relationship between the dynamical instability of planetary systems and the uniformity of planetary masses within the system, quantified by the Gini index.
Dong-Hong Wu +2 more
doaj +2 more sources
Abundances in Planetary Nebulae An Autopsy of Low and Intermediate Mass Stars [PDF]
arXiv, 2004 In this work I report on the results of synthetic thermally pulsing asymptotic giant branch models (TP-AGB) and compare the results to the abundance ratios in a sample of planetary nebulae. I use updated input parameters for mass-loss, the stellar luminosity, and dredge-up.
J. F. Buell
arxiv +3 more sources
Convective Mixing in Gas Giant Planets with Primordial Composition Gradients [PDF]
The Astrophysical JournalLinking atmospheric measurements to the bulk planetary composition and ultimately the planetary origin is a key objective in planetary science. In this work, we identify the cases in which the atmospheric composition represents the bulk composition.
Henrik Knierim, Ravit Helled
doaj +2 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
Gaia DR3 astrometric orbit determination with Markov chain Monte Carlo and genetic algorithms. Systems with stellar, sub-stellar, and planetary mass companions [PDF]
Astronomy & Astrophysics, 2022 Astrometric discovery of sub-stellar mass companions orbiting stars is exceedingly hard due to the required sub-milliarcsecond precision, limiting the application of this technique to only a few instruments on a target-per-target basis as well as the ...
B. Holl +10 more
semanticscholar +1 more source
Near-infrared Accretion Signatures from the Circumbinary Planetary-mass Companion Delorme 1 (AB)b [PDF]
Astrophysical Journal Letters, 2022 Accretion signatures from bound brown dwarf and protoplanetary companions provide evidence for ongoing planet formation, and accreting substellar objects have enabled new avenues to study the astrophysical mechanisms controlling the formation and ...
S. Betti +10 more
semanticscholar +1 more source
ALMA Discovery of a Disk around the Planetary-mass Companion SR 12 c [PDF]
Astrophysical Journal Letters, 2022 We report an Atacama Large Millimeter/submillimeter Array 0.88 mm (Band 7) continuum detection of the accretion disk around SR 12 c, an ∼11 M Jup planetary-mass companion (PMC) orbiting its host binary at 980 au. This is the first submillimeter detection
Ya-Lin Wu +8 more
semanticscholar +1 more source