Zobrazeno 1 - 10
of 717
pro vyhledávání: '"Hermes J. J."'
Autor:
Casewell, S. L., Burleigh, M. R., Napiwotzki, R., Zorotovic, M., Bergeron, P., French, J. R., Hermes, J. J., Faedi, F., Lawrie, K. L.
GD1400AB was one of the first known white dwarf$+$brown dwarf binaries, and is the only one of these systems where the white dwarf is a ZZ Ceti pulsator. Here we present both radial velocity measurements and time series photometry, analysing both the
Externí odkaz:
http://arxiv.org/abs/2410.08716
Autor:
Rouis, Lou Baya Ould, Hermes, J. J., Gänsicke, Boris T., Sahu, Snehalata, Koester, Detlev, Tremblay, P. -E., Veras, Dimitri, Farihi, Jay, Heintz, Tyler M., Fusillo, Nicola Pietro Gentile, Redfield, Seth
As the descendants of stars with masses less than 8 M$_{\odot}$ on the main sequence, white dwarfs provide a unique way to constrain planetary occurrence around intermediate-mass stars (spectral types BAF) that are otherwise difficult to measure with
Externí odkaz:
http://arxiv.org/abs/2410.06335
Analyzing all 120 s and 20 s light curves obtained by the TESS satellite up to Sector 69 - the end of the fifth year of observations - for all known white dwarfs and white dwarf candidates up to G=17.5 mag, we report the discovery of 32 new pulsating
Externí odkaz:
http://arxiv.org/abs/2407.07260
Autor:
Inight, Keith, Gänsicke, Boris T., Schwope, Axel, Anderson, Scott F., Breedt, Elmé, Brownstein, Joel R., Demasi, Sebastian, Friedrich, Susanne, Hermes, J. J., Long, Knox S., Mulvany, Timothy, Pallathadka, Gautham A., Salvato, Mara, Scaringi, Simone, Schreiber, Matthias R., Stringfellow, Guy S., Thorstensen, John R., Zakamska, Nadia L.
SDSS-V is carrying out a dedicated survey for white dwarfs, single and in binaries, and we report the analysis of the spectroscopy of 505 cataclysmic variables (CVs) and CV candidates obtained during the first 34 months of observations of SDSS-V. We
Externí odkaz:
http://arxiv.org/abs/2406.19459
Autor:
Guidry, Joseph A., Hermes, J. J., De, Kishalay, Rouis, Lou Baya Ould, Ewing, Brison B., Kaiser, B. C.
Roughly 2% of white dwarfs harbor planetary debris disks detectable via infrared excesses, but only a few percent of these disks show a gaseous component, distinguished by their double-peaked emission at the near-infrared calcium triplet. Previous st
Externí odkaz:
http://arxiv.org/abs/2406.18646
Autor:
Heintz, Tyler M., Hermes, J. J., Tremblay, P. -E., Rouis, Lou Baya Ould, Redding, Joshua S., Kaiser, B. C., van Saders, Jennifer L.
White dwarf stars have been used for decades as precise and accurate age indicators. This work presents a test of the reliability of white dwarf total ages when spectroscopic observations are available. We conduct follow-up spectroscopy of 148 indivi
Externí odkaz:
http://arxiv.org/abs/2405.02423
Autor:
Steen, Maya, Hermes, J. J., Guidry, Joseph A., Paiva, Annabelle, Farihi, Jay, Heintz, Tyler M., Ewing, Brison B., Berry, Nathanial
Publikováno v:
ApJ 967 (2024) 166
White dwarf stars are ubiquitous in the Galaxy, and are essential to understanding stellar evolution. While most white dwarfs are photometrically stable and reliable flux standards, some can be highly variable, which can reveal unique details about t
Externí odkaz:
http://arxiv.org/abs/2404.02201
Autor:
Chiti, Federica, van Saders, Jennifer L., Heintz, Tyler M., Hermes, J. J., Ong, J. M. Joel, Hey, Daniel R., Ramirez-Weinhouse, Michele M., Dugas, Alison
Gyrochronology, a valuable tool for determining ages of low-mass stars where other techniques fail, relies on accurate calibration. We present a sample of 327 wide ($>$$100$\,au) white dwarf + main sequence (WD + MS) binary systems. Total ages of WDs
Externí odkaz:
http://arxiv.org/abs/2403.12129
Autor:
Xing, Keyu, Zong, Weikai, Silvotti, Roberto, Fu, Jian-Ning, Charpinet, Stéphane, Cang, Tianqi, Hermes, J. J., Ma, Xiao-Yu, Wang, Haotian, Wang, Xuan, Wu, Tao, Wang, Jiaxin
Stellar flares are critical phenomena on stellar surfaces, which are closely tied to stellar magnetism. While extensively studied in main-sequence (MS) stars, their occurrence in evolved compact stars, specifically hot subdwarfs and white dwarfs (WDs
Externí odkaz:
http://arxiv.org/abs/2402.16018
Autor:
Mullally, Susan E., Debes, John, Cracraft, Misty, Mullally, Fergal, Poulsen, Sabrina, Albert, Loic, Thibault, Katherine, Reach, William T., Hermes, J. J., Barclay, Thomas, Kilic, Mukremin, Quintana, Elisa V.
We report the discovery of two directly imaged, giant planet candidates orbiting the metal-rich DAZ white dwarfs WD 1202-232 and WD 2105-82. JWST's Mid-Infrared Instrument (MIRI) data on these two stars show a nearby resolved source at a projected se
Externí odkaz:
http://arxiv.org/abs/2401.13153