Results 41 to 50 of about 6,740 (303)

Investigating Possible Binarity for GJ 229B

The Astrophysical Journal Letters, 2023
GJ 229B, the first type-T brown dwarf to be discovered, has presented a tension between comparisons with evolutionary models and the larger-than-expected mass and radius values derived from spectroscopic and astrometric observations.
Alex R. Howe, Avi M. Mandell, Michael W. McElwain   +2 more
doaj   +1 more source

Time-resolved Optical Polarization Monitoring of the Most Variable Brown Dwarf

The Astronomical Journal, 2023
Recent atmospheric models for brown dwarfs suggest that the existence of clouds in substellar objects is not needed to reproduce their spectra, nor their rotationally induced photometric variability, believed to be due to the heterogeneous cloud coverage
Elena Manjavacas, Paulo A. Miles-Páez, Theodora Karalidi, Johanna M. Vos, Max L. Galloway, Julien H. Girard   +5 more
doaj   +1 more source

Binaries discovered by the SPY project. IV, Five single-lined DA double white dwarfs [PDF]

, 2005
We present results from our ongoing follow-up observations of double white dwarf binaries detected in the ESO SN Ia Progenitor SurveY (SPY). We discuss our observing strategy and data analysis and present the orbital solutions of five close double white ...
Roelofs, Gijs H. A., Napiwotzki, Ralf, C. Karl, Voss, B., Izzard, R.G., T. Reerink, N. Christlieb, G. Nelemans, Roelofs, G., R. Napiwotzki, Napiwotzki, R., T. R. Marsh, M. Montgomery, Marsh, T. R., Reimers, D., D. Reimers, Christlieb, N., G. Roelofs, Izzard, R. G., Reerink, T., B. Voss, Montgomery, M., Roelofs, G.H.A., Karl, C., Nelemans, G., Marsh, T.R., R. G. Izzard, Nelemans, G.A.   +27 more
core   +1 more source

Brown Dwarf Retrievals on FIRE!: Atmospheric Constraints and Lessons Learned from High Signal-to-noise Medium-resolution Spectroscopy of a T9 Dwarf

The Astrophysical Journal, 2023
Brown dwarf spectra offer vital testbeds for our understanding of the chemical and physical processes that sculpt substellar atmospheres. Recently, atmospheric retrieval approaches have been successfully applied to low-resolution ( R ∼ 100) spectra of L,
Callie E. Hood, Jonathan J. Fortney, Michael R. Line, Jacqueline K. Faherty   +3 more
doaj   +1 more source

The 2MASS Wide-Field T Dwarf Search. II. Discovery of Three T Dwarfs in the Southern Hemisphere [PDF]

The Astronomical Journal, 2003
We present the discovery of three new Southern Hemisphere T dwarfs identified in the Two Micron All Sky Survey. These objects, 2MASS 0348-6022, 2MASS 0516-0445, and 2MASS 2228-4310, have classifications T7, T5.5, and T6.5, respectively. Using linear absolute magnitude/spectral type relations derived from T dwarfs with measured parallaxes, we estimate ...
Burgasser, Adam J., McElwain, Michael W., Kirkpatrick, J. Davy   +2 more
openaire   +2 more sources

Extending the Canada-France Brown Dwarf Survey to the near infrared

EPJ Web of Conferences, 2011
We present the first results of the Canada-France Brown Dwarfs Survey-InfraRed, hereafter CFBDSIR, our near infrared extension to the optical wide field survey CFBDS.
Bertin E., Willott C.J., Reylé C., Delfosse X., Artigau E., Forveille T., Delorme P., Albert L., Allard F.   +8 more
doaj   +1 more source

The GALAH Survey : Lithium-strong KM dwarfs

, 2019
Identifying and characterizing young stars in the Solar neighbourhood is essential to find and describe planets in the early stages of their evolution. This work seeks to identify nearby young stars showing a lithium 6708 Å absorption line in the GALAH ...
Martell, S.,, Traven, G., Zwitter, T., Casagrande, L., De Silva, G., Horner, J., De Silva, G.,, Martell, S., Nordlander, T., Buder, S.,, Zerjal, M., GALAH Collaboration, Nordlander, T.,, Buder, S., Casagrande, L.,, Lin, J., Čotar, K., Åotar, K.,, Zwitter, T.,, Ireland, M. J.,, Collaboration, G., Åotar, K., Ireland, M., Ireland, M. J., Zerjal, M.,, Horner, J.,, Lin, J.,   +26 more
core   +1 more source

Why human connection is the true metric of research success

FEBS Open Bio, EarlyView.
Human‐centred mentorship can be shaped by mentor attributes, actions, intrinsic drive and career ambition. Drawing on reflections across Singapore and France, as well as workshop insights from FEBS‐IUBMB ENABLE 2024, this article shows that human‐centred mentorship creates the conditions for sustainable growth, well‐being and retention in research ...
Timothy Lin Yun Tan, Mattias Wei Ren Kon, Xavier Coumoul, Fun Man Fung   +3 more
wiley   +1 more source

THE PHYSICAL PROPERTIES OF FOUR ∼600 K T DWARFS [PDF]

The Astrophysical Journal, 2009
26 pages, including 2 Tables and 9 Figures, accepted for publication in Astrophysical ...
Leggett, S. K., Cushing, Michael C., Saumon, D., Marley, M. S., Roellig, T. L., Warren, S. J., Burningham, Ben, Jones, H. R. A., Kirkpatrick, J. D., Lodieu, N., Lucas, P. W., Mainzer, A. K., Martín, E.L., McCaughrean, M. J., Pinfield, D. J., Sloan, G. C., Smart, R. L., Tamura, M., Van Cleve, J.   +18 more
openaire   +3 more sources

The Coldest Known Y Dwarfs: Estimates of Their Effective Temperatures

The Astrophysical Journal
For a decade there has been a factor of 2.5 gap in luminosity between the 275 K WISE J085510.83-071442.5 and all other Y dwarfs, with T _eff  ≳ 350 K. Recently, three objects were found that may fall in this gap.
S. K. Leggett
doaj   +1 more source