Search Publications
A Serendipitous Observation of the Recently Discovered Cataclysmic Variable TUVO-21acq
Kuntz, K. D.; Pfeifle, Ryan W.; Weaver, Kimberly A. +2 more
The recently discovered non-magnetic cataclysmic variable TUVO-21acq was serendipitously observed in a quiescent state during an XMM-Newton observing campaign for the starburst galaxy NGC 4945. Data from this campaign was combined with archival serendipitous XMM observations to examine its X-ray and UV/optical characteristics. TUVO-21acq was found…
A Diamond Ring in X-Ray: Investigating the Diffuse Emission of Supernova Remnant G28.8+1.5
Zhang, Kaiyue
Supernova remnants are products of supernova explosions, which are usually observed in the X-ray band. However, the diffuse emission from the galactic supernova remnant G28.8+1.5 has been overlooked following initial searches for pulsars and pulsar wind nebulae. This paper presents background-subtracted imaging and spatial-resolved spectral analys…
SPECtrophotometer for TRansmission Spectroscopy of Exoplanets (SPECTR)
Lee, Byeong-Cheol; Park, Myeong-Gu; Choi, Yeon-Ho +9 more
The SPECtrophotometer for TRansmission spectroscopy of exoplanets (SPECTR) is a new low-resolution optical (3800–6850 Å) spectrophotometer installed at the Bohyunsan Optical Astronomy Observatory 1.8 m telescope. SPECTR is designed for observing the transmission spectra of transiting exoplanets. Unique features of SPECTR are its long slit length o…
Atmospheric Parameters and Abundances of Cool Red Giant Stars
Dencs, Z.; Derekas, A.; Mitnyan, T. +10 more
Understanding the atmospheric parameters of stars on the top of the RGB is essential to reveal the chemical composition of the Milky Way, as they can be used to probe the farthest parts of our Galaxy. Our goal is to determine the chemical composition of 21 RGB stars with T eff < 4200 K selected from the APOGEE-2 DR17 database using n…
The Goldstone Apple Valley Radio Telescope (GAVRT) Search for Extra Terrestrial Intelligence (SETI)
Gorjian, Varoujan; Lazio, Joseph; Levin, Steven +6 more
This paper reports the results from a student-led Search for Extraterrestrial Intelligence (SETI), also known as technosignatures, targeting the plane of the Milky Way as a part of the Goldstone Apple Valley Radio Telescope (GAVRT) collaboration between the Lewis Center for Educational Research (LCER) and the Jet Propulsion Laboratory. Students as…
Embedded Star Catalog Calculation Tool for Autonomous Star Trackers
Bürger, Karoline C.; Fialho, Fábio de O.; Aykroyd, Christopher R. B.
Autonomous star trackers are crucial attitude sensors for spacecraft three-axis control. They are the most accurate commercial-off-the-shelf sensors available. An autonomous star tracker is an optoelectronic device that autonomously determines the spacecraft's attitude, using an embedded star catalog that is compared to in-orbit images to perform …
Constraints on Testing Post-Newtonian Gravity with Scanning Space Astrometry
Bucciarelli, Beatrice; Lattanzi, Mario G.; Crosta, Mariateresa +4 more
High-precision astrometry has the capability of testing General Relativity in the framework of the parametrized post-Newtonian formalism (PPN). Accurate measurements of gravitational light deflection over the entire celestial sphere open up a potential opportunity for determining the post-Newtonian parameter γ, which governs the deflection strengt…
A Search for Self-lensing Binaries with TESS and Constraints on their Occurrence Rate
El-Badry, Kareem; Yamaguchi, Natsuko; Sorabella, Nicholas M.
Five self-lensing binaries (SLBs) have been discovered with Kepler light curves. They contain white dwarfs (WDs) in AU-scale orbits that gravitationally lens solar-type companions. Forming SLBs likely requires common envelope evolution when the WD progenitor is an AGB star and has a weakly bound envelope. No SLBs have yet been discovered with data…
The ArgusSpec Prototype: Autonomous Spectroscopic Follow-up of Flares Detected by Large Array Telescopes
Law, Nicholas M.; Corbett, Hank; Carney, Jonathan +7 more
ArgusSpec is a prototype autonomous spectroscopic follow-up instrument designed to characterize flares detected by the Argus Pathfinder telescope array by taking short exposure (30 s) broadband spectra (370–750 nm) at low resolutions (R ∼ 150 at 500 nm). The instrument is built from consumer off-the-shelf astronomical equipment, assembled inside a…
AstroSat/UVIT Study of the Diffuse Ultraviolet Radiation in the Dwarf Galaxy Holmberg II
Shalima, P.; Gogoi, Rupjyoti; Bordoloi, Olag Pratim +4 more
We present measurements of diffuse ultraviolet (UV) emission in the dwarf irregular galaxy Holmberg II obtained with the Ultra Violet Imaging Telescope (UVIT) instrument onboard AstroSat, India's first multiwavelength space mission. With a spatial resolution of 1.″2–1.″6, these are the highest resolution UV observations of the galaxy to date. We f…