Results 91 to 100 of about 22,040,331 (192)

J band Variability of M Dwarfs in the WFCAM Transit Survey [PDF]

, 2012
We present an analysis of the photometric variability of M dwarfs in the WFCAM Transit Survey. Although periodic lightcurve variability in low mass stars is generally dominated by photospheric star spot activity, M dwarf variability in the J band has not
Carlos del Burgo Díaz
core  

Doppler imaging of G-dwarfs in two young open clusters

, 2004
We present Doppler images and surface differential rotation measurements of two open cluster G-dwarfs: R58 (G2V; v sin i = 92 kms−1) in IC 2602 and VXR45A (G9V; v sin i = 238 km s−1) in IC 2391. According to Stauffer et al.
Waite, I. A., Waite, I.A., Donati, J-F., Carter, B.D., Donati, J. -F., Marsden, S. C., Marsden, S.C., Carter, B. D.   +7 more
core   +1 more source

Massive white dwarfs in Rastall-Rainbow gravity [PDF]

, 2023
We investigate the hydrostatic equilibrium of white dwarfs within the framework of Rastall-Rainbow gravity, aiming to explore the effects of this modified gravitational theory on their properties.
Lin, Wenbin, Li, Jie, Yang, Bo
core  

Brown Dwarf Candidates in the JADES and CEERS Extragalactic Surveys

The Astrophysical Journal
By combining the James Webb Space Telescope (JWST)/NIRCam JADES and CEERS extragalactic data sets, we have uncovered a sample of 21 T and Y brown dwarf candidates at best-fit distances between 0.1 and 4.2 kpc. These sources were selected by targeting the
Kevin N. Hainline, Jakob M. Helton, Benjamin D. Johnson, Fengwu Sun, Michael W. Topping, Jarron M. Leisenring, William M. Baker, Daniel J. Eisenstein, Ryan Hausen, Raphael E. Hviding, Jianwei Lyu, Brant Robertson, Sandro Tacchella, Christina C. Williams, Christopher N. A. Willmer, Thomas L. Roellig   +15 more
doaj   +1 more source

The Diversity of Cold Worlds: A Blended-light Binary Straddling the T/Y Transition in Brown Dwarfs

The Astrophysical Journal
We present the first brown dwarf spectral binary characterized with JWST: WISE J014656.66+423410.0, the coldest blended-light brown dwarf binary straddling the T/Y transition.
Daniella C. Bardalez Gagliuffi, Jacqueline K. Faherty, Genaro Suárez, Sherelyn Alejandro Merchan, Brianna Lacy, Ben Burningham, Klara Matuszewska, Rocio Kiman, Johanna M. Vos, Austin Rothermich, Jonathan Gagné, Caroline Morley, Melanie J. Rowland, Dan Caselden, Aaron Meisner, Adam C. Schneider, Marc J. Kuchner, Charles A. Beichman, Peter R. Eisenhardt, Christopher R. Gelino, Ehsan Gharib-Nezhad, Eileen C. Gonzales, Federico Marocco, Niall Whiteford, J. Davy Kirkpatrick   +24 more
doaj   +1 more source

UKIDSS detections of cool brown dwarfs

, 2012
Aims. We contribute to improving the census of cool brown dwarfs (late-T and Y dwarfs) in the immediate solar neighbourhood. Methods. By combining near-infrared (NIR) data of UKIDSS with mid-infrared WISE and other available NIR (2MASS) and red ...
R.-D. Scholz, O. Schnurr, J. Storm, G. Bihain   +3 more
core   +1 more source

A Deep Search for Exomoons around WISE 0855 with JWST

The Astronomical Journal
The James Webb Space Telescope (JWST) is collecting time-series observations of many free-floating planets (FFPs) to study their weather, but these light curves provide ideal datasets for locating exomoons that transit FFPs during observations.
Mikayla J. Wilson, Mary Anne Limbach, Andrew J. Skemer, Johanna M. Vos, Brittany E. Miles, Melanie J. Rowland, Andrew Vanderburg, Adam C. Schneider, Caroline Morley, Brooke Kotten, Andrew Householder, Roxana Lupu, James Mang, Richard Freedman   +13 more
doaj   +1 more source

Microphysics of Water Clouds in the Atmospheres of Y Dwarfs and Temperate Giant Planets

, 2022
Water clouds are expected to form on Y dwarfs and giant planets with equilibrium temperatures near or below that of Earth, drastically altering their atmospheric compositions and their albedos and thermal emission spectra. Here we discuss how we used the 1D Community Aerosol and Radiation Model for Atmospheres (CARMA) to investigate the microphysics of
openaire   +2 more sources

Discovery of three distant, cold brown dwarfs in the WFC3 infrared spectroscopic parallels survey

, 2012
We present the discovery of three late-type (≥T4.5) brown dwarfs, including a probable Y dwarf, in the WFC3 Infrared Spectroscopic Parallels (WISP) survey.
Siana, B, Bunker, A, Henry, A, Hathi, NP, Colbert, J, Malkan, M, Teplitz, H, Scarlata, C, Atek, H, McCarthy, P, Rafelski, M, Masters, D, Ross, NR, Burgasser, AJ, Dressler, A   +14 more
core   +1 more source

JWST Spectral Retrieval of Cold Directly Imaged Planet WD 0806 b and the First Measurement of Altitude-dependent Kzz in Exoplanet Atmospheres

The Astronomical Journal
WD 0806 b is a rare exoplanet companion orbiting a white dwarf, currently with a projected orbital distance of 2500 au. The Spitzer mid-IR photometry suggests that the temperature is as cold as 350 K, making it one of the coldest directly imaged ...
Ben W.P. Lew, Thomas Roellig, Natasha E. Batalha, Nicholas F. Wogan, Thomas Greene, Mark S. Marley, Jonathan J. Fortney, Jarron Leisenring, Doug Johnstone, Matthew De Furio, Klaus Hodapp, Charles Beichman, Marcia Rieke   +12 more
doaj   +1 more source