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The K2-OjOS Project: New and revisited planets and candidates in K2 campaigns 5, 16, & 18
Bonavera, L.; González-Nuevo, J.; Korth, J. +28 more
We present the first results of K2-OjOS, a collaborative project between professional and amateur astronomers primarily aimed to detect, characterize, and validate new extrasolar planets. For this work, 10 amateur astronomers looked for planetary signals by visually inspecting the 20 427 light curves of K2 campaign 18 (C18). They found 42 planet c…
Solar Energetic Particles Produced during Two Fast Coronal Mass Ejections
Wang, Yuming; Guo, Jingnan; Li, Xiaolei +1 more
Two recent extremely fast coronal mass ejections (CMEs) are of particular interest. The first one originated from the southern hemisphere on 2021 October 28 and caused strong solar energetic particle (SEP) events over a wide longitude range from Earth, STEREO-A, to Mars. However, the other one, originating from the center of the Earth-viewed solar…
Data Fusion of Total Solar Irradiance Composite Time Series Using 41 Years of Satellite Measurements
Schmutz, W.; Haberreiter, M.; Dudok de Wit, T. +4 more
Since the late 1970s, successive satellite missions have been monitoring the sun's activity and recording the total solar irradiance (TSI). Some of these measurements have lasted for more than a decade. In order to obtain a seamless record whose duration exceeds that of the individual instruments, the time series have to be merged. Climate models …
Low Mass Stars as Tracers of Star and Cluster Formation
Megeath, S. T.; Gutermuth, R. A.; Kounkel, M. A.
We review the use of young low mass stars and protostars, or young stellar objects (YSOs), as tracers of star formation. Observations of molecular clouds at visible, infrared, radio and X-ray wavelengths can identify and characterize the YSOs populating these clouds, with the ability to detect deeply embedded objects at all evolutionary stages. Su…
Orbital Elements and Individual Component Masses from Joint Spectroscopic and Astrometric Data of Double-line Spectroscopic Binaries
Anguita-Aguero, Jennifer; Mendez, Rene A.; Clavería, Rubén M. +1 more
We present orbital elements, orbital parallaxes, and individual component masses for 14 spatially resolved double-line spectroscopic binaries derived doing a simultaneous fit of their visual orbit and radial velocity curve. This was done by means of a Markov Chain Monte Carlo code developed by our group that produces posterior distribution functio…
An Intensity Mapping Constraint on the CO-galaxy Cross-power Spectrum at Redshift 3
Marrone, Daniel P.; Keating, Garrett K.; Keenan, Ryan P.
The abundance of cold molecular gas plays a crucial role in models of galaxy evolution. While deep spectroscopic surveys of CO emission lines have been a primary tool for measuring this abundance, the difficulty of these observations has motivated alternative approaches to studying molecular gas content. One technique, line intensity mapping, seek…
The galaxy-halo size relation of low-mass galaxies in FIRE
Faucher-Giguère, Claude-André; Wetzel, Andrew; Feldmann, Robert +7 more
Galaxy sizes correlate closely with the sizes of their parent dark matter haloes, suggesting a link between halo formation and galaxy growth. However, the precise nature of this relation and its scatter remains to be understood fully, especially for low-mass galaxies. We analyse the galaxy-halo size relation (GHSR) for low-mass ($M_\star \sim 10^{…
Age dissection of the vertical breathing motions in Gaia DR2: evidence for spiral driving
Debattista, Victor P.; Khachaturyants, Tigran; Ghosh, Soumavo
Gaia DR2 has revealed breathing motions in the Milky Way, with stars on both sides of the Galactic mid-plane moving coherently towards or away from it. The generating mechanism of these breathing motions is thought to be spiral density waves. Here, we test this hypothesis. Using a self-consistent, high-resolution simulation with star formation, an…
TESS discovery of a sub-Neptune orbiting a mid-M dwarf TOI-2136
Triaud, Amaury H. M. J.; Latham, David W.; Howell, Steve B. +63 more
We present the discovery of TOI-2136 b, a sub-Neptune planet transiting a nearby M4.5V-type star every 7.85 d, identified through photometric measurements from the Transiting Exoplanet Survey Satellite (TESS) mission. The host star is located 33 pc away with a radius of R* = 0.34 ± 0.02 R⊙, a mass of $0.34\pm 0.02 \, \mathrm{…
Stellar Atmospheric Parameters of M-type Stars from LAMOST DR8
Gao, Qi; Wu, Yue; Yan, Hong-Liang +9 more
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Low Resolution Spectroscopic Survey (LRS) provides massive spectroscopic data on M-type stars, and the derived stellar parameters could bring vital help to various studies. We adopt the ULySS package to perform χ 2 minimization with model spectra generated from the M…