Search Publications
Eight New Candidate Multiplanet Systems among TESS Objects of Interest
Kunimoto, Michelle; Munavar Hussain, Mohamed Jassim
We present a search of the TESS Object of Interest (TOI) Catalog for new multiplanet systems. We perform a Box Least Squares search on light curves prepared by the Quick-Look Pipeline to recover known candidates and perform a targeted search for additional candidates in each system. Following vetting and manual inspection, we present eight new pla…
Planetary Mass Determinations from a Simplified Photodynamical Model—Application to the Complete Kepler Dataset
Aharonson, Oded; Ofir, Aviv; Yoffe, Gideon
We use PyDynamicaLC, a model using the least number of—and the least correlated—degrees of freedom needed to derive a photodynamical model, to describe some of the smallest—and lowest-transit-timing-variation-amplitude—of the Kepler planets. We successfully analyze 64 systems containing 218 planets, for 88 of which we were able to determine signif…
TOI-6038 A b: A Dense Sub-Saturn in the Transition Regime between the Neptunian Ridge and Savanna
Bieryla, Allyson; Latham, David W.; Eastman, Jason D. +13 more
We present the discovery and characterization of a sub-Saturn exoplanet, TOI-6038 A b, using the PARAS-2 spectrograph. The planet orbits a bright (mV = 9.9), metal-rich late F-type star, TOI-6038 A, with Teff = 6110 ± 100 K,
Structural Parameters of the Thin Disk Population from Evolved Stars in the Solar Neighborhood
Bilir, Selçuk; Plevne, Olcay; Önal Taş, Özgecan +1 more
This study investigates the structural parameters of the thin-disk population by analyzing the spatial distribution of evolved stars in the solar neighborhood. From the Gaia Data Release 3 database, about 39.1 million stars within 1 kpc and with relative parallax errors σϖ/ϖ ≤ 0.10 were selected. The photometric data was corrected for e…
The Stellar Disk Structure Revealed by the Mono-age Populations of the LAMOST Red Clump Star Sample
Chen, Bingqiu; Wang, Chun; Liu, Xiaowei +2 more
Understanding the structure of the Galactic disk is crucial for understanding the formation and evolutionary history of the Milky Way. This study examines the structure of the Galactic disk by analyzing a sample of 138,667 primary red clump (RC) stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope and Gaia data sets. We have ca…
Minute-cadence Observations of the LAMOST Fields with the TMTS. VI. Physical Parameters of Contact Binaries
Shi, Jianrong; Wang, Xiaofeng; Li, Kai +16 more
With the development of wide-field surveys, a large amount of data on short-period W UMa contact binaries have been obtained. Continuous and uninterrupted light curves as well as high-resolution spectroscopic data are crucial in determining the absolute physical parameters. Targets with both TMTS light curves and LAMOST medium-resolution spectra w…
Variations of Absolute Source Positions Determined from Quad-band VLBI Observations
Xu, Ming Hui; Charlot, Patrick
Active galactic nuclei (AGNs) observed with the very long baseline interferometry (VLBI) technique are used as fiducial references on the sky to precisely measure the shape and orientation of the Earth. Their positions form a celestial reference frame that plays an important role in both astronomy and geodesy. This study investigates the accuracy …
Filling the Gap: The Missing Eclipses of γ Persei from 2005 and from 2006
Molnár, László; Ádám, Rozália Z.
γ Persei is a long-period (P ≈ 14.6 yr) eclipsing binary system. Its period makes it a difficult target to fully understand: so far, only two primary eclipses are known in the literature, from 1990 and from 2019, whereas the 2005 one was missed due to its closeness to the Sun at the time. We aimed to fill in this gap by processing the quasi-contin…
The Solar Neighborhood. LII. M Dwarf Twin Binaries—Presumed Identical Twins Appear Fraternal in Variability, Rotation, Hα, and X-Rays
Henry, Todd J.; Osten, Rachel A.; Jao, Wei-Chun +4 more
We present an investigation into the rotation and stellar activity of four fully convective M dwarf "twin" wide binaries. Components in each pair have (1) astrometry confirming they are common-proper-motion binaries, (2) Gaia BP, RP, and 2MASS J, H, and K s magnitudes matching within 0.10 mag, and (3) presumably the same age and compo…
CDN-Net: Faint Celestial Target Detection Based on Densely Nested Hierarchical Network
Chen, Guo; Xue, Bindang; Li, Xinyang +2 more
The detection of celestial objects in ground-based wide-field optical telescope images serves as the foundational step for subsequent celestial analysis tasks. Existing methods for astronomical target detection have not addressed the challenges posed by a high dynamic range, faintness of targets, and an inaccurate supervision map. This paper prese…