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Effective Temperature Estimations from Line Depth Ratios in the H- and K-band Spectra of IGRINS
Jaffe, Daniel T.; Mace, Gregory N.; Afşar, Melike +5 more
Determining accurate effective temperatures of stars buried in the dust-obscured Galactic regions is extremely difficult from photometry. Fortunately, high-resolution infrared spectroscopy is a powerful tool for determining the temperatures of stars with no dependence on interstellar extinction. It has long been known that the depth ratios of temp…
Phenomenological modelling of the Crab Nebula's broadband energy spectrum and its apparent extension
Horns, D.; Dirson, L.
Context. The Crab Nebula emits exceptionally bright non-thermal radiation across the entire wavelength range from the radio to the most energetic photons. So far, the underlying physical model of a relativistic wind from the pulsar terminating in a hydrodynamic standing shock has remained fairly unchanged since the early 1970s when it was first in…
An APEX Study of Molecular Outflows in FUor-type Stars
Henning, Thomas; Ábrahám, Péter; Kóspál, Ágnes +4 more
The FU Orionis-type objects (FUors) are low-mass pre-main-sequence objects that go through a short-lived phase (~100 yr) of increased mass accretion rate (from 10-8 to 10-4 M ⊙ yr-1). These eruptive young stars are in the early stages of stellar evolution and thus still deeply embedded in a massive envel…
The orbital period versus absolute magnitude relationship of intermediate polars: implications for low states and outbursts
Mukai, Koji; Pretorius, Magaretha L.
Recent advances in time-domain astronomy have led to fresh observational insights into intermediate polars, a subtype of magnetic cataclysmic variables generally accreting via a partial accretion disc. These new discoveries include detections of superhumps, low states, and outbursts. However, these studies have largely relied on relative photometr…
The Spin-Orbit Misalignment of TOI-1842b: The First Measurement of the Rossiter-McLaughlin Effect for a Warm Sub-Saturn around a Massive Star
Rice, Malena; Wang, Songhu; Hixenbaugh, Kyle +1 more
The mechanisms responsible for generating spin-orbit misalignments in exoplanetary systems are still not fully understood. It is unclear whether these misalignments are related to the migration of hot Jupiters or are a consequence of general star and planet formation processes. One promising method to address this question is to constrain the dist…
As Simple as Possible but No Simpler: Optimizing the Performance of Neural Net Emulators for Galaxy SED Fitting
Johnson, Benjamin D.; Tacchella, Sandro; Suess, Katherine A. +7 more
Artificial neural network emulators have been demonstrated to be a very computationally efficient method to rapidly generate galaxy spectral energy distributions, for parameter inference or otherwise. Using a highly flexible and fast mathematical structure, they can learn the nontrivial relationship between input galaxy parameters and output obser…
Value-added Catalog of M-giant Stars in LAMOST DR9
Chen, Li; Zhong, Jing; Xue, Xiang-Xiang +9 more
In this work, we update the catalog of M-giant stars from the low-resolution spectra of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 9. There are 58,076 M giants identified from the classification pipeline with seven temperature subtypes from M0 to M6. The 2471 misclassified non-M-giant stars are white dwarf …
J-PLUS: Photometric Recalibration with the Stellar Color Regression Method and an Improved Gaia XP Synthetic Photometry Method
Huang, Yang; Beers, Timothy C.; Cenarro, A. J. +19 more
We employ the corrected Gaia Early Data Release 3 photometric data and spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR7 to assemble a sample of approximately 0.25 million FGK dwarf photometric standard stars for the 12 J-PLUS filters using the stellar color regression (SCR) method. We then independ…
Protoplanetary disks around young stellar and substellar objects in the σ
Paul, K. T.; Jose, Jessy; Damian, Belinda +1 more
Understanding the evolution and dissipation of protoplanetary disks are crucial in star and planet formation studies. We report the protoplanetary disk population in the nearby young
AllBRICQS: The All-sky BRIght, Complete Quasar Survey
Wolf, Christian; Lai, Samuel; Onken, Christopher A. +3 more
We describe the first results from the All-sky BRIght, Complete Quasar Survey (AllBRICQS), which aims to discover the last remaining optically bright quasars. We present 156 spectroscopically confirmed quasars (140 newly identified) having $|b|>10^{\circ}$ . 152 of the quasars have Gaia DR3 magnitudes brighter than $BP=16.5$ or $R