Search Publications
Gen TSO: A General JWST Simulator for Exoplanet Times-series Observations
Cubillos, Patricio E.
GEN TSO is a noise calculator specifically tailored to simulate James Webb Space Telescope (JWST) time-series observations of exoplanets. GEN TSO enables the estimation of signal-to-noise ratios (S/Ns) for transit or eclipse depths through an interactive graphical interface, similar to the JWST Exposure Time Calculator (ETC). This interface levera…
ROME/REA: Three-year, Tri-color Timeseries Photometry of the Galactic Bulge
Saha, A.; Mao, S.; Zang, Weicheng +11 more
The Robotic Observations of Microlensing Events/Reactive Event Assessment Survey was a Key Project at Las Cumbres Observatory (hereafter LCO) which continuously monitored 20 selected fields (3.76 sq.deg) in the Galactic Bulge throughout their seasonal visibility window over a three-year period, between 2017 March and 2020 March. Observations were …
Enhancing Exoplanet Ephemerides by Leveraging Professional and Citizen Science Data: A Test Case with WASP-77 A b
Dalba, Paul A.; Zellem, Robert T.; Evans, Phil +42 more
We present an updated ephemeris, and physical parameters, for the exoplanet WASP-77 A b. In this effort, we combine 64 ground- and space-based transit observations, 6 space-based eclipse observations, and 32 radial velocity observations to produce this target's most precise orbital solution to date aiding in the planning of James Webb Space Telesc…
Time Variability of FUV Emission from Cool Stars on Multi-year Timescales
France, Kevin; Youngblood, Allison; Kamgar, Leo
The physical and chemical properties of planetary atmospheres are affected by temporal evolution of ultraviolet (UV) radiation inputs from their host stars at all time scales. While studies of X-ray/UV flare properties and long-term stellar evolution of exoplanet host stars have provided new constraints regarding stellar inputs to exoplanetary sys…
Optimal Fitting and Debiasing for Detectors Read Out Up-the-Ramp
Brandt, Timothy D.
This paper derives the optimal fit to a pixel's count rate in the case of an ideal detector read out nondestructively in the presence of both read and photon noise. The approach is general for any readout scheme, provides closed-form expressions for all quantities, and has a computational cost that is linear in the number of resultants (groups of …
Mid-infrared Fine Structure Lines from the Galactic Warm Ionized Medium
Kulkarni, S. R.; Beichman, Charles; Ressler, Michael E.
The Warm Ionized Medium (WIM) hosts most of the ionized gas in the Galaxy and occupies perhaps a quarter of the volume of the Galactic disk. Decoding the spectrum of the Galactic diffuse ionizing field is of fundamental interest. This can be done via direct measurements of ionization fractions of various elements. Based on current physical models …
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…