Results 71 to 80 of about 23,116,162 (197)

The MUSCLES Extension for Atmospheric Transmission Spectroscopy: Spectral Energy Distributions for 20 Exoplanet Host Stars that JWST Observed in Cycle 1

The Astronomical Journal
Correctly interpreting JWST spectra of close-in exoplanets requires a measurement of the X-ray and ultraviolet light that the planets receive from their host stars.
David J. Wilson, Allison Youngblood, Girish M. Duvvuri, Kevin France, P. Christian Schneider, Alexander Brown, Isabella Longo, Cynthia S. Froning, Jacob L. Bean, J. Sebastian Pineda, Eliza M.-R. Kempton, Yamila Miguel, Thomas M. Evans-Soma, Zachory Berta-Thompson   +13 more
doaj   +1 more source

The Importance of the Upper Atmosphere to CO/O2 Runaway on Habitable Planets Orbiting Low-mass Stars

The Astrophysical Journal Letters, 2023
Efforts to spectrally characterize the atmospheric compositions of temperate terrestrial exoplanets orbiting M dwarf stars with JWST are now underway.
Sukrit Ranjan, Edward W. Schwieterman, Michaela Leung, Chester E. Harman, Renyu Hu   +4 more
doaj   +1 more source

THE ULTRAVIOLET RADIATION ENVIRONMENT AROUND M DWARF EXOPLANET HOST STARS [PDF]

The Astrophysical Journal, 2013
The spectral and temporal behavior of exoplanet host stars is a critical input to models of the chemistry and evolution of planetary atmospheres. At present, little observational or theoretical basis exists for understanding the ultraviolet spectra of M dwarfs, despite their critical importance to predicting and interpreting the spectra of potentially ...
France, Kevin, Froning, Cynthia S., Linsky, Jeffrey L., Roberge, Aki, Stocke, John T., Tian, Feng, Bushinsky, Rachel, Désert, Jean-Michel, Mauas, Pablo, Vieytes, Mariela, Walkowicz, Lucianne M.   +10 more
openaire   +4 more sources

The Chromospheric Activity and Ages of M Dwarf Stars in Wide Binary Systems [PDF]

, 2005
We investigate the relationship between age and chromospheric activity for 139 M dwarf stars in wide binary systems with white dwarf companions. The age of each system is determined from the cooling age of its white dwarf component. The current limit for
Terry D. Oswalt, Suzanne L. Hawley, Silvestri, Nicole M, Hawley, Suzanne L., Oswalt, Terry D, Nicole M. Silvestri, Hawley, Suzanne L, Silvesteri, Nicole M., Oswalt, T. D.   +8 more
core   +1 more source

Spectroscopic Characterization of WD J000801.25-350450 and Its Two Comoving Companions

The Astronomical Journal
We present new spectroscopic data for Gaia DR3 2309499817384726016 (WD 0008-350A) and its two wide, comoving, low-mass companions. We confirm the white dwarf is a hydrogen rich DA, with T _eff = 6200 ± 90 K and a mass of 0.63 ± 0.03 M _⊙ , close to that ...
Peter A. Jałowiczor, Thomas P. Bickle, J. Davy Kirkpatrick, Sarah L. Casewell, Nicola Gentile Fusillo, Adam C. Schneider, Jonathan Gagné, Jacqueline K. Faherty, Aaron M. Meisner, Marc J. Kuchner, Adam J. Burgasser, Austin Rothermich, Alexia Bravo, Michiharu Hyogo, Mark Popinchalk, Alex J. Brown, Alberto Rebassa-Mansergas, Raquel Murillo-Ojeda, The Backyard Worlds: Planet 9 Collaboration   +18 more
doaj   +1 more source

ULTRACAM observations of two accreting white dwarf pulsators [PDF]

, 2009
In this paper, we present high time-resolution observations of GW Librae (GW Lib) and SDSS J161033.64-010223.3 (SDSS 1610) - two cataclysmic variables which have shown periodic variations attributed to non-radial pulsations of the white dwarf (WD).
Southworth, J., Copperwheat, C.M., Copperwheat, C. M., Woudt, P. A., Steeghs, D., Gaensicke, B. T., Dhillon, V. S., Littlefair, S.P., Woudt, P.A., Gänsicke, B.T., Warner, Brian, Marsh, T.R., Warner, B., Dhillon, V.S., Littlefair, S. P., Marsh, T. R.   +15 more
core   +1 more source

X-Ray, UV, and Optical Observations of Proxima Centauri’s Stellar Cycle

The Astrophysical Journal
Proxima Cen (GJ 551; dM5.5e) is one of only about a dozen fully convective stars known to have a stellar cycle, and the only one to have long-term X-ray monitoring.
Bradford J. Wargelin, Steven H. Saar, Zackery A. Irving, Jonathan D. Slavin, Peter Ratzlaff, José-Dias do Nascimento Jr   +5 more
doaj   +1 more source

Photometry of dwarf K and M stars

The Astronomical Journal, 1993
Broadband UBYRI photometry is presented for 688 stars from among the dwarf K and M stars found spectroscopically by Vyssotsky [AJ, 63, 211 (1958)].
openaire   +1 more source

Elemental abundances in the Galactic bulge from microlensed dwarf stars [PDF]

, 2010
We present elemental abundances of 13 microlensed dwarf and subgiant stars in the Galactic bulge, which constitute the largest sample to date. We show that these stars span the full range of metallicity from Fe/H= −0.8 to +0.4, and that they follow well ...
Feltzing, S., Adén, Daniel, Johnson, J., Sana, H., Sana, Hugues, Feltzing, Sofia, Johnson, J.A., Melendez, J., Kubas, D., Asplund, M., Bensby, Thomas, Gould, A., Gal-Yam, A., Adén, D., Udalski, A., Lucatello, S., Simmerer, J., Feltzing, Sofia,, Bensby, T., James, G., Simmerer, Jennifer, Bensby, Thomas,   +21 more
core   +1 more source

Metallicities of M Dwarf Planet Host Stars from Kepler, K2, and TESS Observed by APOGEE: Trends with Exoplanetary Radii and Orbital Periods

The Astronomical Journal
One important property in studying the exoplanet population is the host star metallicity ([M/H]). In this study, we derived stellar metallicities and oxygen abundances for 48 M dwarf stars using the near-infrared high-resolution spectra from the SDSS ...
Fábio Wanderley, Katia Cunha, Diogo Souto, Verne V. Smith, Simone Daflon   +4 more
doaj   +1 more source