Search Publications
An Exceptional Dimming Event for a Massive, Cool Supergiant in M51
Smith, Nathan; Strader, Jay; Sand, David J. +6 more
We present the discovery of an exceptional dimming event in a cool supergiant star in the Local Volume spiral M51. The star, dubbed M51-DS1, was found as part of a Hubble Space Telescope (HST) search for failed supernovae (SNe). The supergiant, which is plausibly associated with a very young (≲6 Myr) stellar population, showed clear variability (a…
A Systematic Exploration of Kilonova Candidates from Neutron Star Mergers during the Third Gravitational-wave Observing Run
Fong, W.; Sand, D. J.; Rastinejad, J. C. +9 more
We present a comprehensive analysis of 653 optical candidate counterparts reported during the third gravitational-wave (GW) observing run. Our sample concentrates on candidates from the 15 events (published in GWTC-2, GWTC-3, or not retracted on GraceDB) that had a >1% chance of including a neutron star in order to assess their viability as tru…
Coronal Mass Ejections and Type II Radio Emission Variability during a Magnetic Cycle on the Solar-type Star ϵ Eridani
Ó Fionnagáin, Dúalta; Kavanagh, Robert D.; Vidotto, Aline A. +5 more
We simulate possible stellar coronal mass ejection (CME) scenarios over the magnetic cycle of ϵ Eridani (18 Eridani; HD 22049). We use three separate epochs from 2008, 2011, and 2013, and estimate the radio emission frequencies associated with these events. These stellar eruptions have proven to be elusive, although a promising approach to detect …
Sh 2-301: A Blistered H II Region Undergoing Star Formation
Pandey, Rakesh; Sharma, Saurabh; Panwar, Neelam +6 more
We present a multiwavelength study of the H II region Sh 2-301 (S301) using deep optical data, near-infrared data, radio continuum data, and other archival data at longer wavelengths. A cluster of young stellar objects (YSOs) is identified in the northeast (NE) direction of S301. The Hα and radio continuum images trace the distribution of the ioni…
AT2020hur: A Possible Optical Counterpart of FRB 180916B
Dai, Zi-Gao; Li, Long; Li, Qiao-Chu +4 more
The physical origin of fast radio bursts (FRBs) remains unclear. Finding multiwavelength counterparts of FRBs can provide a breakthrough for understanding their nature. In this work, we perform a systematic search for astronomical transients whose positions are consistent with FRBs. We find an unclassified optical transient AT2020hur (α = 01h…
Extreme Nature of Four Blue-excess Dust-obscured Galaxies Revealed by Optical Spectroscopy
Ueda, Yoshihiro; Terashima, Yuichi; Matsuhara, Hideo +13 more
We report optical spectroscopic observations of four blue-excess dust-obscured galaxies (BluDOGs) identified by the Subaru Hyper Suprime-Cam. BluDOGs are a subclass of dust-obscured galaxies (DOGs; defined with the extremely red color (i - [22])AB ≥ 7.0; Toba et al., showing a significant flux excess in the optical g and r bands over th…
The Proper Motion of the Pulsar J1124-5916 in the Galactic Supernova Remnant G292.0+1.8
Long, Xi; Plucinsky, Paul P.; Patnaude, Daniel J. +1 more
We present the first direct measurement of the proper motion of pulsar J1124-5916 in the young, oxygen-rich supernova remnant G292.0+1.8. Using deep Chandra ACIS-I observations from 2006 to 2016, we measure a positional change of 0.″21 ± 0.″05 over the ~10 yr baseline, or ~0.″02 yr-1. At a distance of 6.2 ± 0.9 kpc, this corresponds to …
The ESO-VLT MIKiS Survey Reloaded: Velocity Dispersion Profile and Rotation Curve of NGC 1904
Vesperini, Enrico; Pallanca, Cristina; Dalessandro, Emanuele +8 more
We present an investigation of the internal kinematic properties of M79 (NGC 1904). Our study is based on radial velocity measurements obtained from the ESO-VLT Multi-Instrument Kinematic Survey (MIKiS) of Galactic globular clusters for more than 1700 individual stars distributed between ~0.″3 and 770″ (~14 three-dimensional half-mass radii) from …
Plasma Composition Measurements in an Active Region from Solar Orbiter/SPICE and Hinode/EIS
Teriaca, Luca; Schmutz, Werner; Warren, Harry P. +28 more
A key goal of the Solar Orbiter mission is to connect elemental abundance measurements of the solar wind enveloping the spacecraft with extreme-UV (EUV) spectroscopic observations of their solar sources, but this is not an easy exercise. Observations from previous missions have revealed a highly complex picture of spatial and temporal variations o…
Connecting Chromospheric Condensation Signatures to Reconnection-driven Heating Rates in an Observed Flare
Qiu, Jiong; Longcope, Dana W.; Zhu, Chunming +1 more
Observations of solar flare reconnection at very high spatial and temporal resolution can be made indirectly at the footpoints of reconnected loops into which flare energy is deposited. The response of the lower atmosphere to this energy input includes a downward-propagating shock called chromospheric condensation, which can be observed in the UV …