Search Publications
DiskMINT: A Tool to Estimate Disk Masses with CO Isotopologues
Pascucci, Ilaria; Gorti, Uma; Ruaud, Maxime +1 more
CO is one of the most abundant molecules in protoplanetary disks, and optically thin emission from its isotopologues has been detected in many of them. However, several past works have argued that reproducing the relatively low emission of CO isotopologues requires a very low disk mass or significant CO depletion. Here, we present a Python code, D…
Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: The Low-luminosity Cases and an Application to Sgr A*
Ho, Luis C.; Wang, Jian-Min; Li, Yan-Rong +3 more
In this paper, we investigate the astrophysical processes of stellar-mass black holes (sMBHs) embedded in advection-dominated accretion flows (ADAFs) of supermassive black holes (SMBHs) in low-luminosity active galactic nuclei. The sMBH is undergoing Bondi accretion at a rate lower than the SMBH. Outflows from the sMBH-ADAF dynamically interact wi…
Theoretical Light-curve Models of the Symbiotic Nova CN Cha-Optical Flat Peak for 3 Yr
Kato, Mariko; Hachisu, Izumi
CN Cha is a slow symbiotic nova characterized by a 3 yr long optical flat peak followed by a rapid decline. We present theoretical light curves for CN Cha, based on hydrostatic approximation, and estimate the white-dwarf (WD) mass to be ~0.6 M ⊙ for a low metal abundance of Z = 0.004. These kinds of flat-peak novae are border objects be…
Extreme Red-wing Enhancements of UV Lines during the 2022 March 30 X1.3 Solar Flare
Polito, Vanessa; Xu, Yan; Jing, Ju +3 more
Here, we present the study of a compact emission source during an X1.3 flare on 2022 March 30. Within a ~41 s period (17:34:48 UT to 17:35:29 UT), Interface Region Imaging Spectrograph observations show spectral lines of Mg II, C II, and Si IV with extremely broadened, asymmetric red wings. This source of interest (SOI) is compact, ~1.″6, and is l…
Kinetic Features of Alpha Particles in a Pestchek-like Magnetic Reconnection Event in the Solar Wind Observed by Solar Orbiter
Verscharen, Daniel; He, Jiansen; Fedorov, Andrey +10 more
The acceleration and heating of solar wind particles by magnetic reconnection are important mechanisms in space physics. Although alpha particles (4He2+) are the second most abundant population of solar wind ions, their kinetic behavior in solar wind magnetic reconnection is not well understood. Using the high-energy (1500-30…
Spatial Evolution of 20 MeV Solar Energetic Proton Events
Kahler, S. W.; Reames, D. V.; Ling, A. G.
The longitudinal extents of solar energetic (E > 10 MeV) particle (SEP) events in the heliosphere are a characteristic important for understanding SEP acceleration and transport as well as their space weather effects. SEP detectors on the STEREO A and B spacecraft launched in 2008, combined with those on Earth-orbiting spacecraft, have enabled …
Absorption-line Observations of {{H}}_{3}(+) and CO in Sight Lines Toward the Vela and W28 Supernova Remnants
Indriolo, Nick
Supernova remnants act as particle accelerators, providing the cosmic-ray protons that permeate the interstellar medium and initiate the ion-molecule reactions that drive interstellar chemistry. Enhanced fluxes of cosmic-ray protons in close proximity to supernova remnants have been inferred from observations tracing particle interactions with nea…
The Spatial and Emission Properties of the Large [O III] Emission Nebula Near M31
Shull, J. Michael; Fesen, Robert A.; Kimeswenger, Stefan +8 more
Drechsler et al. reported the unexpected discovery of a 1.°5 long [O III] emission nebula 1.°2 southeast of the M31 nucleus. Here we present additional images of this large emission arc, called the Strottner-Drechsler-Sainty Object (SDSO), along with radial velocity and flux measurements from low-dispersion spectra. Independent sets of [O III] ima…
3D Spectroscopy with GTC-MEGARA of the Triple AGN Candidate in SDSS J102700.40+174900.8
Shen, Yue; Liu, Xin; Rodríguez-Espinosa, José Miguel +4 more
Triple-active galactic nucleus (AGN) systems are expected to be the result of the hierarchical model of galaxy formation. Since there are very few of them confirmed as such, we present the results of a new study of the triple AGN candidate SDSS J102700.40+174900.8 (center nucleus) through observations with the GTC-MEGARA Integral Field Unit. 1D an…
The Missing Link: Testing Galactic Chemical Evolution Models with the First Multi-isotopic Abundances in Solar Twin Stars
Crossfield, Ian J. M.; Freedman, Richard; Lothringer, Joshua +3 more
We present the first isotopic abundances of both 13CO and C18O in solar twin stars and test the results against several galactic chemical evolution (GCE) models with different nucleosynthesis prescriptions. First, we compare M-band spectra from IRTF/iSHELL to synthetic spectra generated from custom solar atmosphere models usi…