C. M. Lisse
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View article: Composition of Planetary Debris Around the White Dwarf GD 362
Composition of Planetary Debris Around the White Dwarf GD 362 Open
White dwarf stars with high abundances of heavy elements in their atmospheres and infrared excesses are believed to be accreting planetary material. GD 362 is one of the most heavily polluted white dwarfs and has an exceptionally strong mi…
View article: Refining the Migrating Differentiated Planetesimal Disruption Model for Classical T-Tauri Star RW Aur A’s Dimming Events
Refining the Migrating Differentiated Planetesimal Disruption Model for Classical T-Tauri Star RW Aur A’s Dimming Events Open
C. M. Lisse et al. (2022) published a near-infrared time domain spectral study of the dimming events in RW Aurigae A (RWAurA). Emission from the protostellar surface, protostellar atmosphere, accretion disk, and jets was reported, with the…
View article: Real-time Early Solar System Evolution in RW Auriga A: A New Major Dimming Event has Started in 2025 February
Real-time Early Solar System Evolution in RW Auriga A: A New Major Dimming Event has Started in 2025 February Open
In this Note1 we introduce the problem of the highly dynamic T Tauri system RWAurA, and, using new analyses of lightcurves and imaged jet structures, its potential for understanding early solar system formation processes. In the following …
View article: Composition of planetary debris around the white dwarf GD 362
Composition of planetary debris around the white dwarf GD 362 Open
White dwarf stars with high abundances of heavy elements in their atmospheres and infrared excesses are believed to be accreting planetary material. GD 362 is one of the most heavily polluted white dwarfs and has an exceptionally strong mi…
View article: Apache Point Rapid Response Characterization of Primitive Imminent Impactor 2024 RW<sub>1</sub>
Apache Point Rapid Response Characterization of Primitive Imminent Impactor 2024 RW<sub>1</sub> Open
Imminent impactors may be detected only a few hours before their impact with Earth, providing a brief opportunity to characterize them before impact. We describe the characterization of imminent impactor 2024 RW 1 , which was discovered by…
View article: SPHEREx Discovery of Strong Water Ice Absorption and an Extended Carbon Dioxide Coma in 3I/ATLAS
SPHEREx Discovery of Strong Water Ice Absorption and an Extended Carbon Dioxide Coma in 3I/ATLAS Open
In mid-August 2025, 0.75–5.0 μ m SPHEREx imaging spectrophotometric and ancillary NASA-IRTF/SpeX 0.7–2.5 μ m low-resolution spectral observations of 3I/ATLAS were obtained. The combined spectrophotometry is dominated by features due to wat…
View article: Palomar and Apache Point Spectrophotometry of Interstellar Comet 3I/ATLAS
Palomar and Apache Point Spectrophotometry of Interstellar Comet 3I/ATLAS Open
On 2025 July 1st the third interstellar object, 3I/ATLAS or C/2025 N1 (ATLAS), was discovered, with an eccentricity of e = 6.15 ± 0.01 and perihelion of q = 1.357 ± 0.001 au. We report our initial visible to near-infrared (420–1000 nm) spe…
View article: Palomar and Apache Point Spectrophotometry of Interstellar Comet 3I/ATLAS
Palomar and Apache Point Spectrophotometry of Interstellar Comet 3I/ATLAS Open
On July 1st 2025 the third interstellar object, 3I/ATLAS or C/2025 N1 (ATLAS), was discovered, with an eccentricity of $e=6.15 \pm 0.01$ and perihelion of $q=1.357\pm0.001$ au. We report our initial visible to near-infrared (420-1000 nm) s…
View article: JFC Reflectivity Reassessed: Preliminary Albedos and Statistical Trends
JFC Reflectivity Reassessed: Preliminary Albedos and Statistical Trends Open
Comets are widely viewed as preserving some of the compositional and structural properties of the planetesimals in the solar system during its formation. Studying their current physical properties is essential for understanding their surfa…
View article: Evidence for Ongoing Core Expulsion & Refractory Inclusion/Chondrule Formation in the RW Aurigae T-Tauri System
Evidence for Ongoing Core Expulsion & Refractory Inclusion/Chondrule Formation in the RW Aurigae T-Tauri System Open
The Earliest Solar System Materials and Solar System Formation. Sun-like TTauri stars (TTS) grow in their final stages via magnetically focused mass flows from a circumstellar accretion disk (CAD) [1-2; Fig.1]. The CAD is also the site of …
View article: Calibration of SPHEREx Spectral Data for Small Solar System Objects
Calibration of SPHEREx Spectral Data for Small Solar System Objects Open
We present the ongoing effort to construct the catalog of Solar System Object (SSO) spectra obtained by the Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer (SPHEREx). NASA's SPHEREx mission was …
View article: Interstellar comet 3I/ATLAS: discovery and physical description
Interstellar comet 3I/ATLAS: discovery and physical description Open
We present the characteristics of interstellar comet 3I/Asteroid Terrestrial-impact Last Alert System (ATLAS), discovered on 2025 July 1 by the ATLAS. The comet has eccentricity $\simeq$6.1 and velocity at infinity $\simeq$57 km s−1, indic…
View article: Apache Point rapid response characterization of primitive imminent impactor 2024 RW$_1$
Apache Point rapid response characterization of primitive imminent impactor 2024 RW$_1$ Open
Imminent impactors may be detected only a few hours before their impact with Earth, providing a brief opportunity to characterize them before impact. We describe the characterization of imminent impactor 2024 RW$_1$, which was discovered b…
View article: The Ly<i>α</i> Sky as Observed by New Horizons at 57 au
The Ly<i>α</i> Sky as Observed by New Horizons at 57 au Open
During 2023 September the Alice ultraviolet spectrograph on the New Horizons (NH) spacecraft was used to map diffuse Lyα emission over most of the sky, at a range of ∼56.9 au from the Sun. At that distance, models predict that the interpla…
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…
View article: Sequencing Silicates in the Spitzer Infrared Spectrograph Debris Disk Catalog. I. Methodology for Unsupervised Clustering
Sequencing Silicates in the Spitzer Infrared Spectrograph Debris Disk Catalog. I. Methodology for Unsupervised Clustering Open
Debris disks, which consist of dust, planetesimals, planets, and gas, offer a unique window into the mineralogical composition of their parent bodies, especially during the critical phase of terrestrial planet formation spanning 10 yr to a…
View article: Production, Transport, and Destruction of Dust in the Kuiper Belt: The Effects of Refractory and Volatile Grain Compositions
Production, Transport, and Destruction of Dust in the Kuiper Belt: The Effects of Refractory and Volatile Grain Compositions Open
The Venetia Burney Student Dust Counter (SDC) on board the New Horizons spacecraft measures the spatial and size distributions of dust along its trajectory. Models based on early SDC measurements predicted a peak dust number density at a h…
View article: Sequencing Silicates in the IRS Debris Disk Catalog I: Methodology for Unsupervised Clustering
Sequencing Silicates in the IRS Debris Disk Catalog I: Methodology for Unsupervised Clustering Open
Debris disks, which consist of dust, planetesimals, planets, and gas, offer a unique window into the mineralogical composition of their parent bodies, especially during the critical phase of terrestrial planet formation spanning 10 to a fe…
View article: Gas Dynamics in 3 “Dippers”: EPIC 203850058, EPIC 204638512, and EPIC 205151387 in 2017–2018
Gas Dynamics in 3 “Dippers”: EPIC 203850058, EPIC 204638512, and EPIC 205151387 in 2017–2018 Open
We have examined variability of the three dipper stars—EPIC 203850058, EPIC 204638512, and EPIC 205151387—using the SpeX spectrograph on NASA’s Infrared Telescope facility on two nights in 2018. We combined these data with those previously…
View article: MIRI MRS Observations of Beta Pictoris. II. The Spectroscopic Case for a Recent Giant Collision
MIRI MRS Observations of Beta Pictoris. II. The Spectroscopic Case for a Recent Giant Collision Open
Modeling observations of the archetypal debris disk around β Pic, obtained in 2023 January with the MIRI Medium Resolution Spectrograph on board JWST, reveals significant differences compared with that obtained with the Infrared Spectrogra…
View article: New Synoptic Observations of the Cosmic Optical Background with New Horizons
New Synoptic Observations of the Cosmic Optical Background with New Horizons Open
We obtained New Horizons LORRI images to measure the cosmic optical background (COB) intensity integrated over 0.4 μ m ≲ λ ≲ 0.9 μ m. The survey comprises 16 high-Galactic-latitude fields selected to minimize scattered diffuse Galactic lig…
View article: New Synoptic Observations of the Cosmic Optical Background with New Horizons
New Synoptic Observations of the Cosmic Optical Background with New Horizons Open
We obtained New Horizons LORRI images to measure the cosmic optical background (COB) intensity integrated over $0.4\lesssimλ\lesssim0.9{~\rmμm}.$ The survey comprises 16 high Galactic-latitude fields selected to minimize scattered diffuse …
View article: MIRI MRS Observations of Beta Pictoris II. The Spectroscopic Case for a Recent Giant Collision
MIRI MRS Observations of Beta Pictoris II. The Spectroscopic Case for a Recent Giant Collision Open
Modeling observations of the archetypal debris disk around $β$ Pic, obtained in 2023 January with the MIRI MRS on board JWST, reveals significant differences compared with that obtained with the IRS on board Spitzer. The bright 5 - 15 $μ$m…
View article: What Are Minor Planets Made of? Planetary Science with the SPHEREx 0.7 &#8211; 5.0 &#956;m Solar System Object Catalog&#160;
What Are Minor Planets Made of? Planetary Science with the SPHEREx 0.7 – 5.0 μm Solar System Object Catalog  Open
The Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer (SPHEREx), is a cosmological mission in NASA's Medium Explorer (MIDEX) astrophysics program that will launch in early 2025 and perform a 2-yea…
View article: MIRI MRS Observations of β Pictoris. I. The Inner Dust, the Planet, and the Gas
MIRI MRS Observations of β Pictoris. I. The Inner Dust, the Planet, and the Gas Open
We present JWST MIRI Medium Resolution Spectrograph (MRS) observations of the β Pictoris system. We detect an infrared excess from the central unresolved point source from 5 to 7.5 μ m which is indicative of dust within the inner ∼7 au of …
View article: Planetary Defense Use of the SPHEREx Solar System Object Catalog
Planetary Defense Use of the SPHEREx Solar System Object Catalog Open
The upcoming NASA SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer) all-sky 0.7 to 5.0 um spectral survey, to be conducted from 2025 to 2027, provides a unique space-based opportunity to…
View article: MIRI MRS Observations of Beta Pictoris I. The Inner Dust, the Planet, and the Gas
MIRI MRS Observations of Beta Pictoris I. The Inner Dust, the Planet, and the Gas Open
We present JWST MIRI Medium Resolution Spectrograph (MRS) observations of the $β$ Pictoris system. We detect an infrared excess from the central unresolved point source from 5 to 7.5 $μ$m which is indicative of dust within the inner $\sim$…
View article: New Horizons Venetia Burney Student Dust Counter Observes Higher than Expected Fluxes Approaching 60 au
New Horizons Venetia Burney Student Dust Counter Observes Higher than Expected Fluxes Approaching 60 au Open
The NASA New Horizons Venetia Burney Student Dust Counter (SDC) measures dust particle impacts along the spacecraft’s flight path for grains with mass ≥10 −12 g, mapping out their spatial density distribution. We present the latest SDC dus…