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Characterization of geomorphological features of lunar surface using Chandrayaan-1 Mini-SAR and LRO Mini-RF data
Kumar, Shashi; Vashishtha, Ankita
Signatures of UV radiation in low-mass protostars. I. Origin of HCN and CN emission in the Serpens Main region
Harsono, Daniel; Karska, Agata; Tychoniec, Łukasz +6 more
Context. Ultraviolet radiation (UV) influences the physics and chemistry of star-forming regions, but its properties and significance in the immediate surroundings of low-mass protostars are still poorly understood.
Aims: Our aim is to extend the use of the CN/HCN ratio, already established for high-mass protostars, to the low-mass regime to …
The stratified disc wind of MCG-03-58-007
Ballo, L.; Reeves, J. N.; Braito, V. +6 more
Past Suzaku, XMM-Newton, and NuSTAR observations of the nearby (z = 0.03233) bright Seyfert 2 galaxy MCG-03-58-007 revealed the presence of two deep and blue-shifted iron K-shell absorption line profiles. These could be explained with the presence of two phases of a highly ionized, high column density accretion disc wind outflowing with vout1…
Harmonization of RBSP and Arase Energetic Electron Measurements Utilizing ESA Radiation Monitor Data
Miyoshi, Yoshizumi; Shinohara, Iku; Mitani, Takefumi +11 more
Accurate measurements of trapped energetic electron fluxes are of major importance for the studies of the complex nature of radiation belts and the characterization of space radiation environment. The harmonization of measurements between different instruments increases the accuracy of scientific studies and the reliability of data-driven models t…
What's Behind the Elephant's Trunk? Identifying Young Stellar Objects on the Outskirts of IC 1396
Principe, David A.; Wolk, Scott J.; Kim, Jinyoung Serena +2 more
Empirically, the estimated lifetime of a typical protoplanetary disk is <5-10 Myr. However, the disk lifetimes required to produce a variety of observed exoplanetary systems may exceed this timescale. Some hypothesize that this inconsistency is due to estimating disk fractions at the cores of clusters, where radiation fields external to a star-…
Detached Shell Carbon Stars: Tracing Thermal Pulses on the Asymptotic Giant Branch
Kastner, Joel H.; Wilson, Emily
We consider whether the subset of carbon-rich asymptotic giant branch (AGB) stars that exhibit detached, expanding circumstellar shells may reveal the past histories of these stars as having undergone helium shell flashes (thermal pulses) on the AGB. We exploit newly available Gaia parallaxes and photometry, along with archival infrared photometry…
Validation of HD 183579b Using Archival Radial Velocities: A Warm Neptune Orbiting a Bright Solar Analog
Kipping, David; Palatnick, Skyler; Yahalomi, Daniel
As exoplanetary science matures into its third decade, we are increasingly offered the possibility of pre-existing, archival observations for newly detected candidates. This is particularly poignant for the TESS mission, whose survey spans bright, nearby dwarf stars in both hemispheres—precisely the types of sources targeted by previous radial vel…
A massive open cluster hiding in full sight
Chené, A. -N.; Negueruela, I.; Tabernero, H. M. +4 more
Obscuration and confusion conspire to limit our knowledge of the inner Milky Way. Even at moderate distances, the identification of stellar systems becomes compounded by the extremely high density of background sources. Here, we provide a very revealing example of these complications by unveiling a large, massive, young cluster in the Sagittarius …
The Double-bubble Coronal Mass Ejection of the 2020 December 14 Total Solar Eclipse
Druckmüller, Miloslav; Boe, Benjamin; Habbal, Shadia +1 more
Total solar eclipses (TSEs) continue to provide an invaluable platform for exploring the magnetic topology of the solar corona and for studying dynamic events such as coronal mass ejections (CMEs)with a higher spatial resolution over a larger spatially continuous extent than is possible to achieve with any other method at present. In this Letter, …
The JCMT BISTRO-2 Survey: The Magnetic Field in the Center of the Rosette Molecular Cloud
Pattle, Kate; Karoly, Janik; Ward-Thompson, Derek +33 more
We present the first 850 µm polarization observations in the most active star-forming site of the Rosette Molecular Cloud (d ∼ 1.6 kpc) in the wall of the Rosette Nebula, imaged with the SCUBA-2/POL-2 instruments of the James Clerk Maxwell telescope, as part of the B-Fields In Star-forming Region Observations 2 (BISTRO-2) survey. From the PO…