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NEIDSpecMatch: stellar parameter estimation with NEID spectra using an empirical library
Te Han, Paul Robertson, Caleb I. Cañas +16
We introduce NEIDSpecMatch, a tool developed to extract stellar parameters from spectra obtained with the NEID spectrograph. NEIDSpecMatch is based on SpecMatch-Emp and HPFSpecMatc…
A Bayesian Approach to Inferring Accretion Signatures in Young Stellar Objects: A Case Study with VIRUS
Lauren Halstead Willett, Joe P. Ninan, Suvrath Mahadevan +3
The mass accretion rates of young stellar objects (YSOs) are key to understanding how stars form, how their circumstellar disks evolve, and even how planets form. We develop a Baye…
Frequency Comb Calibrated Laser Heterodyne Radiometry for Precision Radial Velocity Measurements
Ryan K. Cole, Connor Fredrick, Winter Parts +6
Disk-integrated observations of the Sun provide a unique vantage point to explore stellar activity and its effect on measured radial velocities. Here, we report a new approach for…
Magnetic Fields in a sample of planet-hosting M dwarf stars from Kepler, K2, and TESS observed by APOGEE
Fábio Wanderley, Katia Cunha, Verne Smith +8
Stellar magnetic fields have a major impact on space weather around exoplanets orbiting low-mass stars. From an analysis of Zeeman-broadened Fe I lines measured in near-infrared SD…
Earths within Reach: Evaluation of Strategies for Mitigating Solar Variability using 3.5 years of NEID Sun-as-a-Star Observations
Eric B. Ford, Chad F. Bender, Cullen H. Blake +15
We present the results of Sun-as-a-star observations by the NEID Solar Telescope at WIYN Observatory, spanning January 1, 2021 through June 30, 2024. We identify 117,060 observatio…
Quiet Please: Detrending Radial Velocity Variations from Stellar Activity with a Physically Motivated Spot Model
Jared C. Siegel, Samuel Halverson, Jacob K. Luhn +15
For solar-type stars, spots and their associated magnetic regions induce radial velocity perturbations through the Doppler rotation signal and the suppression of convective blueshi…
Towards characterising rocky worlds: Trends in chemical make-ups of M dwarfs versus GK dwarfs
Haiyang S. Wang, Sascha P. Quanz, Suvrath Mahadevan +1
Elemental abundances of Sun-like stars are crucial for understanding the detailed properties of their planets. However, measuring elemental abundances in M stars is challenging due…
Astrometry and Precise Radial Velocities Yield a Complete Orbital Solution for the Nearby Eccentric Brown Dwarf LHS 1610 b
Evan Fitzmaurice, Gudmundur Stefánsson, Robert D. Kavanagh +18
The LHS 1610 system consists of a nearby ( pc) M5 dwarf hosting a candidate brown dwarf companion in a day, eccentric () orbit. We confirm this brown dwa…
Stellar Characterization and Radius Inflation of Hyades M Dwarf Stars From the APOGEE Survey
Fábio Wanderley, Katia Cunha, Diogo Souto +23
We present a spectroscopic analysis of a sample of 48 M dwarf stars () from the Hyades open cluster using high-resolution H-band spectra from the…
TOI-5375 B: A Very Low Mass Star at the Hydrogen-Burning Limit Orbiting an Early M-type Star
Mika Lambert, Chad F. Bender, Shubham Kanodia +16
The TESS mission detected a companion orbiting TIC 71268730, categorized it as a planet candidate, and designated the system TOI-5375. Our follow-up analysis using radial velocity…
Characterization of low-mass companions to objects of interest observed with APOGEE-N
Caleb I. Cañas, Chad F. Bender, Suvrath Mahadevan +12
We report the characterization of 28 low-mass () companions to objects of interest (KOIs), eight…
The SDSS-HET Survey of Kepler Eclipsing Binaries. A Sample of Four Benchmark Binaries
Kelly Hambleton, Andrej Prsa, Scott W. Fleming +2
The purpose of this work is to extend a sample of accurately modeled, benchmark-grade eclipsing binaries with accurately determined masses and radii. We select four "well-behaved"…
Detection of p-mode Oscillations in HD 35833 with NEID and TESS
Arvind F. Gupta, Jacob K. Luhn, Jason T. Wright +15
We report the results of observations of p-mode oscillations in the G0 subgiant star HD 35833 in both radial velocities and photometry with NEID and TESS, respectively. We achieve…
The Active Chromospheres of Lithium-Rich Red Giant Stars
Christopher Sneden, Melike Afsar, Zeynep Bozkurt +17
We have gathered near-infrared -band high resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their \species{He}{i} 1083…
Modeling Stellar Surface Features on Subgiant Star with an M-dwarf Companion
Maria C. Schutte, Leslie Hebb, Simon Lowry +7
Understanding magnetic activity on the surface of stars other than the Sun is important for exoplanet analyses to properly characterize an exoplanet's atmosphere and to further cha…
Leveraging space-based data from the nearest Solar-type star to better understand stellar activity signatures in radial velocity data
Tamar Ervin, Samuel Halverson, Abigail Burrows +8
Stellar variability is a key obstacle in reaching the sensitivity required to recover Earth-like exoplanetary signals using the radial velocity (RV) detection method. To explore ac…
Modeling Stellar Oscillations and Granulation in Radial Velocity Time Series: A Fourier-based Method
Zhao Guo, Eric B. Ford, Dennis Stello +4
Tens of thousands of solar-like oscillating stars have been observed by space missions. Their photometric variability in the Fourier domain can be parameterized by a sum of two sup…
Rotational modulation of spectroscopic Zeeman signatures in low-mass stars
Ryan C. Terrien, Allison Keen, Katy Oda +24
Accurate tracers of the stellar magnetic field and rotation are cornerstones for the study of M dwarfs and for reliable detection and characterization of their exoplanetary compani…
An eccentric Brown Dwarf eclipsing an M dwarf
Caleb I. Cañas, Suvrath Mahadevan, Chad F. Bender +16
We report the discovery of a brown dwarf transiting the early M dwarf TOI-2119 on an eccentric orbit () at an orbital period of $7.2008…
Detailed Chemical Abundances for a Benchmark Sample of M Dwarfs from the APOGEE Survey
Diogo Souto, Katia Cunha, Verne V. Smith +16
Individual chemical abundances for fourteen elements (C, O, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, Fe, and Ni) are derived for a sample of M-dwarfs using high-resolution near-infrar…
Gaia 20eae: A newly discovered episodically accreting young star
Arpan Ghosh, Saurabh Sharma, Joe. P. Ninan +18
The Gaia Alert System issued an alert on 2020 August 28, on Gaia 20eae when its light curve showed a 4.25 magnitude outburst. We present multi-wavelength photometric and spec…
High resolution near-infrared spectroscopy of a flare around the ultracool dwarf vB 10
Shubham Kanodia, Lawrence W. Ramsey, Marissa Maney +20
We present high-resolution observations of a flaring event in the M8 dwarf vB 10 using the near-infrared Habitable zone Planet Finder (HPF) spectrograph on the Hobby Eberly Telesco…
: Distinguishing Planet-induced Doppler Signatures from Granulation with a Synthetic Spectra Generator
Michael L. Palumbo, Eric B. Ford, Jason T. Wright +3
Owing to recent advances in radial-velocity instrumentation and observation techniques, the detection of Earth-mass planets around Sun-like stars may soon be primarily limited by i…
Double-lined spectroscopic binaries in the APOGEE DR16 and DR17 data
Marina Kounkel, Kevin R. Covey, Keivan G. Stassun +25
APOGEE spectra offer 1 km s precision in the measurement of stellar radial velocities (RVs). This holds even when multiple stars are captured in the same spectrum,…