Search Publications
Uncovering the MIR emission of quiescent galaxies with JWST
Gómez-Guijarro, C.; Magdis, G. E.; Rigopoulou, D. +15 more
We present a study of the mid-IR (MIR) emission of quiescent galaxies (QGs) beyond the local universe. Using deep JWST imaging in the SMACS-0723 cluster field we identify a mass-limited (M* > 109 M⊙) sample of intermediate redshift QGs (0.2 < z < 0.7) and perform modelling of their rest-frame UV to MIR pho…
Photometric Analysis of Eclipsing Binaries: VY UMi, RU UMi and GSC 04364-00648
Parimucha, Š.; Kudak, V.; Perig, V. +1 more
We present the photometric analysis of BVR and TESS light curves of three eclipsing binaries, together with their period changes considering archival data and new minima times from our and TESS observations. For the first time we detected wave-like variations with low-amplitude in O − C residua of RU UMi, which can be interpreted as a consequence …
Optical Identification of the Shortest-period Spider Pulsar System M71E
Dong, Subo; Liu, Zhuokai
M71E is a spider pulsar (i.e., a millisecond pulsar with a tight binary companion) with the shortest known orbital period of P = 53.3 minutes, which was discovered by Pan et al. Their favored evolutionary model suggests that it bridges between two types of spider pulsars, namely, it descended from a "redback" and will become a "black widow." Using…
Limiting the accretion disc light in two mass transferring hot subdwarf binaries
Mereghetti, Sandro; Piirola, Vilppu; Kupfer, Thomas +6 more
We report the results from follow-up observations of two Roche-lobe filling hot subdwarf binaries with white dwarf companions predicted to have accretion discs. ZTF J213056.71+442046.5 (ZTF J2130) with a 39-min period and ZTF J205515.98+465106.5 (ZTF J2055) with a 56-min period were both discovered as subdwarf binaries with light curves that could…
Photometric study of the overcontact binary V826 Aur
Tobin, R. Wes; Berrington, Robert C.
We present BVRC differential photometry of an eclipsing binary system V826 Aur. A period analysis shows near constant period of 0.36 days across two decades of observation. The best fit models are consistent with a W-type W UMa overcontact binary consisting of a less massive G8 primary star and a more massive K0 secondary star. The mode…
SHARAD observations for layered ejecta deposits formed by late-Amazonian-aged impact craters at low latitudes of Mars
Xiao, Zhiyong; Xu, Rui; Ma, Yizhen +2 more
Frequent changes of the rotational inclination of Mars have driven global transitions of the cryosphere. Although glaciers of water ice may have extended to the equatorial region, current observations of surface deposits at latitudes lower than 30° show relative depletion in hydrogen. Thermal stability models predict that at these low latitudes, a…
A new constraint on HCl abundance at the cloud top of Venus
Sato, Takao M.; Sagawa, Hideo
We provided a new constraint on HCl abundance at the cloud top of Venus by infrared spectroscopy using a cross-dispersed high-resolution echelle spectrograph, iSHELL, mounted on the NASA Infrared Telescope Facility (IRTF). This study investigated the inconsistency in HCl abundance between previous ground-based observations and Venus Express solar …
Nonextensive Behavior of Stellar Rotation in the Galactic Disk Components
da Silva, M. P.; do Nascimento, J. -D.; de Lima, M. M. F. +1 more
The solar neighborhood is a unique stellar astrophysical laboratory formed by a variety of stars from different origins. In particular, two of the most notable populations known are the thick and thin disk stars, each characterized by distinct chemical compositions, ages, kinematics, and origins. Based on Tsallis nonextensive statistics, we invest…
The GeMS/GSAOI Galactic Globular Cluster Survey (G4CS). II. Characterization of 47 Tuc with Bayesian Statistics
Dotter, Aaron; Monty, Stephanie; Puzia, Thomas H. +5 more
We present a photometric analysis of globular cluster 47 Tuc (NGC 104) using near-IR imaging data from the GeMS/GSAOI Galactic Globular Cluster Survey (G4CS), which is in operation at Gemini-South telescope. Our survey is designed to obtain AO-assisted deep imaging with near diffraction-limited spatial resolution of the central fields of Milky Way…
Time-series photometry and multiwavelength characterization of the young stellar cluster Mon R2
Cieza, Lucas A.; Gamen, Roberto; Orcajo, Santiago
Using the Las Cumbres Observatory Global Telescope Network (LCOGT), we have obtained multi-epoch photometry of the young cluster Mon R2. We have monitored over 6000 sources with i-band between 13 and 23 mag within a 26 × 26 arcmin2 field of view. For each star, we collected ~1500 photometric points covering a temporal window of 23 d. Ba…