Adam J. Burgasser
YOU?
Author Swipe
View article: Parallel Application of Slitless Spectroscopy to Analyze Galaxy Evolution (PASSAGE): Survey Overview
Parallel Application of Slitless Spectroscopy to Analyze Galaxy Evolution (PASSAGE): Survey Overview Open
During the second half of Cycle 1 of the James Webb Space Telescope (JWST), we conducted the Parallel Application of Slitless Spectroscopy to Analyze Galaxy Evolution (PASSAGE) program. PASSAGE received the largest allocation of JWST obser…
View article: High Proper Motion Discoveries from the UKIRT Hemisphere Survey
High Proper Motion Discoveries from the UKIRT Hemisphere Survey Open
We used the third data release of the UKIRT Hemisphere Survey to locate previously unrecognized high proper motion objects. We identify a total of 127 new discoveries with total proper motions ≳300 mas yr −1 . A significant fraction of the…
View article: TOI-7166 b: a habitable zone mini-Neptune planet around a nearby low-mass star
TOI-7166 b: a habitable zone mini-Neptune planet around a nearby low-mass star Open
We present the discovery and validation of TOI-7166 b, a $2.01 \pm 0.05\,\mathrm{ R}_{\oplus }$ planet orbiting a nearby low-mass star. We validated the planet by combining Transiting Exoplanet Survey Satellite and multicolour high-precisi…
View article: JWST imaging of omega Centauri
JWST imaging of omega Centauri Open
We present a detailed analysis of the white dwarf (WD) cooling sequence (CS) in omega Centauri based on combined Hubble Space Telescope (HST) and JWST observations. Our analysis confirms the previously reported split –based on HST observat…
View article: Classifying Cool Dwarfs: Comprehensive Spectral Typing of Field and Peculiar Dwarfs Using Machine Learning
Classifying Cool Dwarfs: Comprehensive Spectral Typing of Field and Peculiar Dwarfs Using Machine Learning Open
Low-mass stars and brown dwarfs—spectral types (SpTs) M0 and later—play a significant role in studying stellar and substellar processes and demographics, reaching down to planetary-mass objects. Currently, the classification of these sourc…
View article: Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf
Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf Open
The atmospheres of low-temperature brown dwarfs and gas giant planets are expected to contain the phosphine molecule, PH 3 . However, previous observations have shown much lower abundances of this molecule than predicted with atmospheric c…
View article: TOI-1743 b, TOI-5799 b, TOI-5799 c, and TOI-6223 b: TESS discovery and validation of four super-Earth to Neptune-sized planets around M dwarfs
TOI-1743 b, TOI-5799 b, TOI-5799 c, and TOI-6223 b: TESS discovery and validation of four super-Earth to Neptune-sized planets around M dwarfs Open
We present the discovery by the TESS mission of one transiting Neptune-sized planet, TOI-6223 b, and two transiting super-Earths, TOI-1743 b and TOI-5799 b. We validate these planets using a statistical validation method, multi-color light…
View article: Euclid Quick Data Release (Q1)—Spectroscopic Search, Classification, and Analysis of Ultracool Dwarfs in the Deep Fields
Euclid Quick Data Release (Q1)—Spectroscopic Search, Classification, and Analysis of Ultracool Dwarfs in the Deep Fields Open
The Near-Infrared Spectrometer and Photometer on board the Euclid space mission has obtained near-infrared (NIR) slitless spectra of millions of objects, including hundreds of ultracool dwarfs (UCDs). Euclid observations retrieve images an…
View article: Gravity-sensitive Spectral Indices in Ultracool Dwarfs: Investigating Correlations with Metallicity and Planet Occurrence Using SpeX and Fire Observations
Gravity-sensitive Spectral Indices in Ultracool Dwarfs: Investigating Correlations with Metallicity and Planet Occurrence Using SpeX and Fire Observations Open
We present a near-infrared spectroscopic analysis (0.9–2.4 μ m) of gravity indices for 56 ultracool dwarfs (M5.5–L0), including exoplanet hosts SPECULOOS-2, SPECULOOS-3, and LHS 3154. Our dataset includes 59 spectra from the SpeX and FIRE …
View article: Two warm Earth-sized exoplanets and an Earth-sized candidate in the M5V-M6V binary system TOI-2267
Two warm Earth-sized exoplanets and an Earth-sized candidate in the M5V-M6V binary system TOI-2267 Open
We report the discovery of two warm exoplanets orbiting the cool binary system TOI-2267, composed of the M5 (TOI-2267A) and M6 (TOI-2267B) stars, whose angular separation is 0.384 arcsec, corresponding to a projected distance of only about…
View article: Silicate precursor silane detected in cold low-metallicity brown dwarf
Silicate precursor silane detected in cold low-metallicity brown dwarf Open
View article: Hot Rocks Survey IV: Emission from LTT 3780 b is consistent with a bare rock
Hot Rocks Survey IV: Emission from LTT 3780 b is consistent with a bare rock Open
It is an open question whether small planets around M dwarfs are able to maintain atmospheres. The Hot Rocks Survey aims to address this question by observing 9 rocky exoplanets orbiting M dwarfs with MIRI emission photometry to constrain …
View article: Two warm Earth-sized exoplanets and an Earth-sized candidate in the M5V-M6V binary system TOI-2267
Two warm Earth-sized exoplanets and an Earth-sized candidate in the M5V-M6V binary system TOI-2267 Open
We report two warm Earth-sized exoplanets orbiting the close binary TOI-2267 (M5+M6, separation ~8 au). Data from TESS and ground-based facilities confirm the planets, but we cannot determine which star they orbit. The planets have radii o…
View article: JWST imaging of omega Centauri
JWST imaging of omega Centauri Open
This paper presents the first study of the most massive globular cluster in the Milky Way, omega Centauri (or ω Cen, also known as NGC 5139), employing recently acquired JWST deep images. By combining these data with archival Hubble Space …
View article: A New Brown Dwarf Orbiting an M Star and an Investigation of the Eccentricity Distribution of Transiting Long-period Brown Dwarfs
A New Brown Dwarf Orbiting an M Star and an Investigation of the Eccentricity Distribution of Transiting Long-period Brown Dwarfs Open
The orbital eccentricities of brown dwarfs encode valuable information on their formation and evolution history, providing insights into whether they resemble giant planets or stellar binaries. Here, we report the discovery of TOI-5575 b, …
View article: Spectral Data for Figures 1 and 2 of "Gravity-sensitive Spectral Indices in Ultracool Dwarfs: Investigating Correlations with Metallicity and Planet Occurrence using SpeX and FIRE Observations"
Spectral Data for Figures 1 and 2 of "Gravity-sensitive Spectral Indices in Ultracool Dwarfs: Investigating Correlations with Metallicity and Planet Occurrence using SpeX and FIRE Observations" Open
This dataset contains the near-infrared spectra used to generate Figures 1 and 2 in the paper "Gravity-sensitive Spectral Indices in Ultracool Dwarfs: Investigating Correlations with Metallicity and Planet Occurrence using SpeX and FIRE Ob…
View article: SN 2023ixf in the Pinwheel Galaxy M101: From Shock Breakout to the Nebular Phase
SN 2023ixf in the Pinwheel Galaxy M101: From Shock Breakout to the Nebular Phase Open
We present photometric and spectroscopic observations of supernova SN 2023ixf covering from day 1 to 442 days after explosion. SN 2023ixf reached a peak V -band absolute magnitude of −18.2 ± 0.07, and light curves show that it has a relati…
View article: Comparing Grid Model Fitting Methodologies for Low-temperature Atmospheres: Markov Chain Monte Carlo versus Random Forest Retrieval
Comparing Grid Model Fitting Methodologies for Low-temperature Atmospheres: Markov Chain Monte Carlo versus Random Forest Retrieval Open
The atmospheres of low-temperature stars, brown dwarfs, and exoplanets are challenging to model due to strong molecular features and complex gas and condensate chemistry. Self-consistent atmosphere models are commonly used for spectral fit…
View article: Hubble's Multi-Year Search for Exospheres in the TRAPPIST-1 System Reveals Frequent Microflares
Hubble's Multi-Year Search for Exospheres in the TRAPPIST-1 System Reveals Frequent Microflares Open
Ly-$α$ observations provide a powerful probe of stellar activity and atmospheric escape in exoplanetary systems. We present here an analysis of 104 HST/STIS orbits monitoring the TRAPPIST-1 system between 2017 and 2022, covering 3--5 trans…
View article: Benchmark brown dwarfs – I. A blue M2 + T5 wide binary and a probable young [M4 + M4] + [T7 + T8] hierarchical quadruple
Benchmark brown dwarfs – I. A blue M2 + T5 wide binary and a probable young [M4 + M4] + [T7 + T8] hierarchical quadruple Open
Benchmark brown dwarfs in wide binary systems are crucial for characterizing substellar objects and calibrating atmospheric and evolutionary models. However, brown dwarf benchmarks with subsolar metallicity, very cool temperatures, or suit…
View article: Comparing Grid Model Fitting Methodologies for Low-Temperature Atmospheres: Markov Chain Monte Carlo versus Random Forest Retrieval
Comparing Grid Model Fitting Methodologies for Low-Temperature Atmospheres: Markov Chain Monte Carlo versus Random Forest Retrieval Open
The atmospheres of low-temperature stars, brown dwarfs, and exoplanets are challenging to model due to strong molecular features and complex gas and condensate chemistry. Self-consistent atmosphere models are commonly used for spectral fit…
View article: Kast Optical Spectra of Unclassified Stars Within 20 pc of the Sun
Kast Optical Spectra of Unclassified Stars Within 20 pc of the Sun Open
M- and L-type dwarfs are abundant in the Milky Way, yet many of these nearest sources remain poorly characterized. We present optical spectra for 67 low-luminosity sources within 20 pc of the Sun, 41 of which are optically classified for t…
View article: Spectropolarimetric Evolution of SN 2023ixf: an Asymmetric Explosion in a Confined Aspherical Circumstellar Medium
Spectropolarimetric Evolution of SN 2023ixf: an Asymmetric Explosion in a Confined Aspherical Circumstellar Medium Open
We present complete spectropolarimetric coverage of the Type II supernova (SN) 2023ixf ranging from 1 to 120 days after explosion. Polarimetry was obtained with the Kast double spectrograph on the Shane 3m telescope at Lick Observatory. As…
View article: TOI-6478 b: a cold underdense Neptune transiting a fully convective M dwarf from the thick disc
TOI-6478 b: a cold underdense Neptune transiting a fully convective M dwarf from the thick disc Open
Growing numbers of exoplanet detections continue to reveal the diverse nature of planetary systems. Planet formation around late-type M dwarfs is of particular interest. These systems provide practical laboratories to measure exoplanet occ…
View article: Euclid Quick Data Release (Q1): A photometric search for ultracool dwarfs in the Euclid Deep Fields
Euclid Quick Data Release (Q1): A photometric search for ultracool dwarfs in the Euclid Deep Fields Open
We present a catalogue of more than 5000 new ultracool dwarf (UCD) candidates in the three Euclid Deep Fields in the Q1 data release. They range from late M to late T dwarfs, and include 1200 L and T dwarfs. More than 100 of them have been…
View article: New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs
New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs Open
We report the results of a spectroscopic survey of candidate T subdwarfs identified by the Backyard Worlds: Planet 9 program. Near-infrared spectra of 31 sources with red J − W2 colors and large J -band reduced proper motions show varying …
View article: TOI-6508 b: A massive transiting brown dwarf orbiting a low-mass star
TOI-6508 b: A massive transiting brown dwarf orbiting a low-mass star Open
We report the discovery of a transiting brown dwarf orbiting a low-mass star, TOI-6508 b. Today, only ∼50 transiting brown dwarfs have been discovered. TOI-6508 b was first detected with data from the Transiting Exoplanet Survey Satellite …
View article: The <i>Gaia</i> ultracool dwarf sample – VI. Spectral types and properties of 51 ultracool dwarfs
The <i>Gaia</i> ultracool dwarf sample – VI. Spectral types and properties of 51 ultracool dwarfs Open
Near-infrared spectra from the IRTF/SpeX and Blanco/ARCoIRIS telescope/instrument combinations are used for spectroscopic classification, to measure radial velocities, and for the inference of astrophysical properties of 51 Gaia-selected n…
View article: The Gaia Ultracool Dwarf Sample -- VI. Spectral Types and Properties of 51 Ultracool Dwarfs
The Gaia Ultracool Dwarf Sample -- VI. Spectral Types and Properties of 51 Ultracool Dwarfs Open
Near-infrared spectra from the IRTF/SpeX and Blanco/ARCoIRIS telescope/instrument combinations are used for spectroscopic classification, to measure radial velocities and for the inference of astrophysical properties of 51 Gaia-selected ne…
View article: Unveiling the infrared excess of SIPS J2045–6332: evidence for a young stellar object with potential low-mass companion
Unveiling the infrared excess of SIPS J2045–6332: evidence for a young stellar object with potential low-mass companion Open
The Disc Detective project, a citizen science initiative, aims to identify circumstellar discs around stars by detecting objects with infrared (IR) excess using data from the Wide-field Infrared Survey Explorer (WISE). In this study, we in…