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Distance Determination of RR Lyrae Stars AE Leo, AT Vir, and HY Com
Soper, C.; Tenenbaum, C.; Lounsbery, A. +2 more
We present the results of our observations and analyses of three RR Lyrae variable stars: AT Vir, HY Com, and AE Leo, in order to test period-luminosity relationships derived from stellar models. We have measured the periods of these stars to be 0.52359, 0.44898, and 0.63021 days, respectively, closely matching previous work. Period-Luminosity-Met…
BViz Photometry of the RR Lyrae Star RU Ceti
Fickle, J.; Allen, M. L.
The RR Lyrae star RU Cet was observed between October 26 and November 23, 2020. The observations were taken in the B, V, ip, and zs filters, with the telescope images being analyzed using various aperture photometry methods. The period of variation for RU Cet was found to be 0.585 ± 0.020 day. Theoretical period-luminosity-metallicity relations in…
The MOSDEF survey: a new view of a remarkable z = 1.89 merger
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +13 more
We present a detailed study of a galaxy merger taking place at z = 1.89 in the GOODS-S field. Here, we analyse Keck/MOSFIRE spectroscopic observations from the MOSFIRE Deep Evolution Field (MOSDEF) survey along with multiwavelength photometry assembled by the 3D-HST survey. The combined data set is modelled to infer the past star formation histori…
Timing analysis of a sample of five cataclysmic variable candidates observed by the XMM-Newton satellite
Nucita, A. A.; De Paolis, F.; Franco, A. +4 more
Intermediate polars are a class of cataclysmic variables in which a white dwarf accretes material from a companion star. The intermediate polar nature confirmation usually derives from the detection of two periods in both X-ray and optical photometry. In this respect, the high-energy signal is often characterized by modulations on the white dwarf …
MAVEN Proton Observations Near the Martian Moon Phobos: Does Phobos Backscatter Solar Wind Protons?
André, N.; Halekas, J. S.; Fowler, C. M. +7 more
ESA's Mars Express (MEX) may have observed twice solar wind protons backscattered by Phobos. However, these detections remain uncertain and call for an independent confirmation. Here, we analyze the proton measurements collected by the Suprathermal And Thermal Ion Composition experiment onboard NASA's Mars Atmosphere and Volatile EvolutioN mission…
Locating dust and molecules in the inner circumstellar environment of R Sculptoris with MATISSE
Meisenheimer, K.; Augereau, J. -C.; Wolf, S. +50 more
Context. Asymptotic giant branch (AGB) stars are one of the main sources of dust production in the Galaxy. However, it is not yet clear what this process looks like and where the dust happens to be condensing in the circumstellar environment.
Aims: By characterizing the location of the dust and the molecules in the close environment of an AGB…
Discovery of a new supergiant fast X-ray transient MAXI J0709-159 associated with the Be star LY Canis Majoris
Liu, Zhu; Kawai, Nobuyuki; Shidatsu, Megumi +10 more
We report on the discovery of a new supergiant fast X-ray transient (SFXT), MAXI J0709-159, and its identification with LY CMa (also known as HD 54786). On 2022 January 25, a new flaring X-ray object, named MAXI J0709-159, was detected by the Monitor of All-sky X-ray Image (MAXI). Two flaring activities were observed in two scans ~3 hr apart, wher…
Impacts of thrusting, extensional faulting, and glaciation on cratering records of Pluto's largest moon Charon: Implications for the evolution of Kuiper belt objects
Yin, An; Chen, HanZhang
Systematic geomorphological mapping and detailed landform analysis using the highest resolution images obtained by the New Horizons spacecraft reveal the presence of a range of differentiable terrains on Charon, the largest moon of Pluto, that were not examined in detail by the early studies. The most important findings of our work include (1) tru…
X-Ray Emission from Candidate Stellar Merger Remnant TYC 2597-735-1 and Its Blue Ring Nebula
Hoadley, Keri; Schneider, P. C.; Günther, Maximilian N. +3 more
Tight binary or multiple-star systems can interact through mass transfer and follow vastly different evolutionary pathways than single stars. The star TYC 2597-735-1 is a candidate for a recent stellar merger remnant resulting from a coalescence of a low-mass companion with a primary star a few thousand years ago. This violent event is evident in …
Episodic and declining fluvial processes in Noctis Fossae, Syria Planum Province, Mars
Chavan, Anil; Sarkar, Subham; Bhandari, Subhash
The Noachian surfaces across Mars bear abundant evidence for aqueous processes; however, the transformation of the planet from warm and wet to the present-day cold and dry is unclear. A key question is whether these processes continued by the same or different magnitudes in the Hesperian and Amazonian times. The equatorial region of Mars has exten…