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Modeling Circumstellar Gas Emission around a White Dwarf Using CLOUDY
Weinberger, Alycia J.; Steele, Amy; Xu, Siyi +9 more
The chemical composition of an extrasolar planet is fundamental to its formation, evolution, and habitability. In this study, we explore a new way to measure the chemical composition of the building blocks of extrasolar planets by measuring the gas composition of the disrupted planetesimals around white dwarf stars. As a first attempt, we used the…
Direct Observational Evidence of Multi-epoch Massive Star Formation in G24.47+0.49
Sanhueza, Patricio; Tej, Anandmayee; Hwang, Jihye +19 more
Using new continuum and molecular line data from the Atacama Large Millimeter/submillimeter Array Three-millimeter Observations of Massive Star-forming Regions (ATOMS) survey and archival Very Large Array, 4.86 GHz data, we present direct observational evidence of hierarchical triggering relating three epochs of massive star formation in a ringlik…
The Epoch of Giant Planet Migration Planet Search Program. II. A Young Hot Jupiter Candidate around the AB Dor Member HS Psc
Cochran, William D.; Mahadevan, Suvrath; Tran, Quang H. +6 more
We report the discovery of a hot Jupiter candidate orbiting HS Psc, a K7 (≈0.7 M ⊙) member of the ≈130 Myr AB Doradus moving group. Using radial velocities over 4 yr from the Habitable-zone Planet Finder spectrograph at the Hobby–Eberly Telescope, we find a periodic signal of ${P}_{b}={3.986}_{-0.003}^{+0.044}$ days. A joint Keplerian a…
Periodicity from X-ray sources within the inner Galactic disk
Hailey, Charles J.; Mori, Kaya; Morris, Mark R. +9 more
Aims: For many years it had been claimed that the Galactic ridge X-ray emission at the Galactic Center (GC) is truly diffuse in nature. However, with the advancement of modern X-ray satellites, it has been found that most of the diffuse emission actually comprises thousands of previously unresolved X-ray point sources. Furthermore, many studi…
Straight outta photosphere: Open solar flux without coronal modeling
Tähtinen, Ismo; Asikainen, Timo; Mursula, Kalevi
Context. The open solar flux, that is, the total magnetic flux escaping the Sun, is one of the most important parameters connecting solar activity to the Earth. The open solar flux is commonly estimated from photospheric magnetic field measurements by making model assumptions about the solar corona. However, the question in which way the open sola…
A comprehensive analysis towards the Fermi-LAT source 4FGL J1846.9-0227: jets of a protoplanetary nebula producing γ-rays?
Ortega, M. E.; Paron, S.; Petriella, A.
Most of the $\gamma$-ray sources in the Fermi-LAT 14-yr source catalogue are associated with pulsars and blazars. However, unveiling the nature of the still unassociated $\gamma$-ray sources is important for the understanding of high energy emission mechanisms in astrophysical objects. This work presents a comprehensive study towards the region co…
Relative Occurrence Rate between Hot and Cold Jupiters as an Indicator to Probe Planet Migration
Fulton, Benjamin J.; Gan, Tianjun; Mao, Shude +4 more
We propose a second-order statistic parameter ɛ, the relative occurrence rate between hot Jupiters (HJs) and cold Jupiters (CJs) (ɛ = η HJ/η CJ), to probe the migration of gas giants. Since the planet occurrence rate is the combined outcome of the formation and migration processes, a joint analysis of HJ and CJ frequency may …
Quasiperiodic Oscillations of Flare Loops and Slipping Motion of Ribbon Substructures during a C-class Flare
Li, Ting; Ye, Jing; Zhang, Yining
Quasiperiodic oscillations in solar-flaring emission have been observed over the past few decades. To date, the underpinning processes resulting in the quasiperiodic oscillations remain unknown. In this paper, we report a unique event that exhibits both the long-duration quasiperiodic intensity oscillations of flare loops and the quasiperiodic sli…
Deep Search for a Scattered Light Dust Halo Around Vega with the Hubble Space Telescope
Wolff, Schuyler G.; Wilner, David J.; Rieke, George H. +6 more
We present a provisory scattered-light detection of the Vega debris disk using deep Hubble Space Telescope (HST) coronagraphy (PID 16666). At only 7.7 pc, Vega is immensely important in debris disk studies both for its prominence and also because it allows the highest physical resolution among all debris systems relative to temperature zones aroun…
Magnetic Field Alignment Relative to Multiple Tracers in the High-mass Star-forming Region RCW 36
Fissel, Laura M.; Cunningham, Maria; Jones, Paul +9 more
We use polarization data from SOFIA HAWC+ to investigate the interplay between magnetic fields and stellar feedback in altering gas dynamics within the high-mass star-forming region RCW 36, located in Vela C. This region is of particular interest as it has a bipolar H II region powered by a massive star cluster, which may be impacting the surround…