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Diffuse Interstellar Bands λ6379, λ6614, and λ6660 in the LAMOST-MRS Spectra
Luo, A. -Li; Hou, Wen; Zhao, Yong-Heng +2 more
Diffuse interstellar bands (DIBs) have always been a mysterious existence in astronomical research. In this work, we provide more DIB samples to slightly uncover this mystery. With the LAMOST medium-resolution survey (MRS) spectra, we detected three DIBs λ6379, λ6614, and λ6660, obviously superimposed on the spectra of 11,003 stars. These spectra …
Radial velocities from far-red spectra of Carina Arm O and early B stars
Drew, J. E.; Blake-Parsons, F.; Mohr-Smith, M.
Massive O and early B stars are important markers of recent star formation and exert a significant influence on their environments during their short lives via photoionization and winds and when they explode as supernovae. In the Milky Way, they can be detected at great distances but often lie behind large dust columns, making detection at short w…
Locating Red Supergiants in the Galaxy NGC 6822
Massey, Philip; Levesque, Emily M.; Neugent, Kathryn F. +1 more
Using archival near-IR photometry, we identify 51 of the K-band brightest red supergiants (RSGs) in NGC 6822 and compare their physical properties with stellar evolutionary model predictions. We first use Gaia parallax and proper motion values to filter out foreground Galactic red dwarfs before constructing a J-K versus K color-magnitude diagram t…
Titan's haze at opposite seasons from HST-STIS spectroscopy
Karkoschka, Erich
We present an analysis of three new image cubes of Titan by the Space Telescope Imaging Spectrograph taken in 2017, 2018, and 2019, half a Titan year after previously analyzed image cubes. Both data sets probe periods when Titan's seasonal north-south-asymmetry switched. The new observations show that the new reversal came exactly half a Titan yea…
Adsorption-driven Gas Trapping in Cometary Ice Analogs
Yokochi, Reika
Icy planetary bodies carry volatiles in abundances that should reflect the conditions of their formation. However, the interpretation of volatile abundance data from comets is complicated by the fact that the governing parameters and underlying mechanism of volatile trapping are poorly constrained. To unravel the mechanism of gas trapping in water…
Ma'adim Vallis, Mars: Insights into episodic and late-stage water activity from an impact crater
Harish; Vijayan, S.; Tuhi, S. +4 more
Alluvial fans, a form of sedimentary deposit reported on Mars, offer insight into the evolution and nature of fluvial activity on the planet. Additionally, the region's preserved mineralogy can also be used to study its hydrological history. In this context, we discuss the diverse geomorphology and mineralogy of an unnamed crater that formed on th…
Activity of the Young Star TOI 837 with an Exoplanet
Savanov, I. S.
—Based on high-precision data from the archive of the TESS space mission, a study was made of the photometric brightness variability of TOI 837—a young star with an exoplanet, a member of the southern sky cluster IC 2602. Based on all available observational results, we have estimated the star's rotation period and brightness variability amplitude…
Testing Model-determined Temperatures in the Hyades: A Bayesian Approach
Joner, Michael D.; Jeffery, Elizabeth J.; Taylor, Benjamin J.
Gains in our understanding of stellar evolution over the last century are largely due to improvements in stellar models. One key aspect in the use of these models is a reliable transformation between theoretical values (such as luminosity and temperature) to observable quantities (such as magnitude and color). To assess the current state of this t…
Sub-field of view surface thermal modeling of Cassini CIRS observations of Rhea during south polar winter
Howett, Carly J. A.; Miles, Georgina; Spencer, John +1 more
Rhea's exosphere is thought to originate from sources of carbon, water ice and other volatiles that arrived at Rhea by bombardment. Its seasonal variability is directly driven by polar surface temperatures allowing surface adsorption, and the persistence of source volatiles require that seasonal temperatures remain sufficiently cold to retain them…
Quaternionic Transform: A new Light on the Solar Power Spectrum
Garrido, Rafael; Ayala, Adrián; Pascual-Granado, Javier +2 more
Asteroseismology, that is, the use of the frequency content of a time series caused by variations in brightness or radial velocity of a stellar object, is based on the hypothesis that such a series is harmonic and therefore can be described by a sum of sines and cosines. If this were not the case (e.g., the oscillations of an ellipsoid of revoluti…