Near-Ultraviolet and Optical Observations of the White Dwarf ZTF J0328$-$1219 Reveal Variable Periodicity in its Transiting Debris System

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   Time-resolved protoplanetary disk physics in DQ Tau with JWST

   Á. Kóspál, P. Ábrahám, V. V. Akimkin et al. · 2025 · A&A 703, A20 (2025) · cited 2 times · AI summary available

   Time-resolved protoplanetary disk physics in DQ Tau tracks disk responses to periodic accretion changes, while this paper tracks evolving debris transits around a white dwarf.

   Abstract

   Accretion variability is ubiquitous in YSOs. While large outbursts may strongly affect the disk, the effects of moderate bursts are less understood. We aim to study the physical response of the disk around the eccentric binary system DQ Tau to its periodic accretion changes. We organized a multi-wavelength campaign centered on four JWST/MIRI spectra. We targeted three periastrons (high accretion state) and one apastron (quiescence). We used optical and near-infrared spectroscopy and photometry to measure how the accretion luminosity varies. We decomposed the multi-epoch SEDs into stellar, accretion, and rim components. We fitted the solid-state features using various opacity curves and the m…

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   JWST Imaging of Edge-on Protoplanetary Disks. V. Flux Ratio Reversal and Disk-edge Structure in the Flying Saucer

   Jie Ma, Karl R. Stapelfeldt, Marion Villenave et al. · 2026 · Earth and Planetary Astrophysics · AI summary available

   JWST Imaging of the Flying Saucer characterizes an edge-on protoplanetary disk through infrared imaging, whereas this paper studies transiting debris around a white dwarf.

   In short

   JWST reveals near-infrared brightness reversal and bright disk-edge linings in the Flying Saucer, consistent with inner-disk misalignment, forward scattering, and substantial dust growth.

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   Beyond the Fast Rotators: A JWST Multi-Cycle Treasury Survey of Substellar Weather

   Natalia Oliveros-Gomez, Elena Manjavacas, Niall Whiteford et al. · 2026 · Instrumentation and Methods for Astrophysics · AI summary available

   Beyond the Fast Rotators proposes time-resolved spectroscopy to study atmospheric variability in substellar objects, unlike this paper’s observations of white-dwarf debris transits.

   In short

   The paper proposes a roughly 1,500-hour JWST survey to systematically study how rotation, viewing geometry, and atmospheric evolution shape brown dwarf and giant-exoplanet weather.

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   A transiting brown dwarf in a 2 hour orbit

   Kareem El-Badry, Kevin B. Burdge, Jan van Roestel et al. · 2023 · Solar and Stellar Astrophysics · cited 19 times · AI summary available

   A transiting brown dwarf in a 2 hour orbit measures a brown dwarf’s properties from stellar transits, while this paper studies debris transiting a white dwarf.

   Abstract

   We report the discovery of ZTF J2020+5033, a high-mass brown dwarf (BD) transiting a low-mass star with an orbital period of 1.90 hours. Phase-resolved spectroscopy, optical and infrared light curves, and precise astrometry from Gaia allow us to constrain the masses, radii, and temperatures of both components with few-percent precision. We infer a BD mass of $M_{\rm BD} = 80.1\pm 1.6\,M_{\rm J}$, almost exactly at the stellar/substellar boundary, and a moderately inflated radius, $R_{\rm BD} = 1.05\pm 0.02\,R_{\rm J}$. The transiting object's temperature, $T_{\rm eff}\approx 1700\,\rm K$, is well-constrained by the depth of the infrared secondary eclipse and strongly suggests it is a BD. The…

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   Coordinated Space and Ground Monitoring of Accretion Bursts in a Protoplanetary Disk: MIRI and iSHELL observe the long-term modulation of gas within a small inner disk cavity

   Jacob Hyden, Andrea Banzatti, Benjamin M. Tofflemire et al. · 2026 · Earth and Planetary Astrophysics · AI summary available

   Coordinated Space and Ground Monitoring tracks molecular gas during DQ Tau’s accretion bursts, rather than changing transit periods and dust around a white dwarf.

   In short

   Coordinated infrared monitoring shows that hot molecular gas in DQ Tau fades and its emitting region moves outward over successive accretion bursts, unlike hydrogen and continuum emission.

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   Tracing the Top-of-the-atmosphere and Vertical Cloud Structure of a fast-rotating late T-dwarf

   Elena Manjavacas, Theodora Karalidi, Xianyu Tan et al. · 2022 · Solar and Stellar Astrophysics · cited 1 time · AI summary available

   Tracing the Top-of-the-atmosphere measures near-infrared variability in a late-T dwarf, whereas this paper measures optical and ultraviolet variability from white-dwarf debris.

   Abstract

   Only a handful of late-T brown dwarfs have been monitored for spectro-photometric variability, leaving incomplete the study of the atmospheric cloud structures of the coldest brown dwarfs, that share temperatures with some cold, directly-imaged exoplanets. 2MASSJ00501994-332240 is a T7.0 rapidly rotating, field brown dwarf that showed low-level photometric variability in data obtained with the Spitzer Space telescope. We monitored 2MASSJ00501994-332240 during ~2.6 hr with MOSFIRE, installed at the Keck I telescope, with the aim of constraining its near-infrared spectro-photometric variability. We measured fluctuations with a peak-to-peak amplitude of 1.48+\-0.75% in the J-band photometric li…

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   A new take on the low-mass brown dwarf companions on wide-orbits in Upper-Scorpius

   Simon Petrus, Mickaël Bonnefoy, Gaël Chauvin et al. · 2019 · A&A 633, A124 (2020) · cited 17 times · AI summary available

   A new take on low-mass brown dwarf companions characterizes young substellar objects with multi-wavelength spectroscopy, unlike this study of transiting debris.

   Abstract

   The Upper-Scorpius association (5-11 Myr) contains a unique population of low-mass (M<30 MJup) brown-dwarfs. The detailed relative characterization of their physical properties (mass, radius, temperature, composition, ongoing accretion) offers the opportunity to potentially explore their origin and their mechanisms of formation. We aim at characterizing the chemical and physical properties of three young, late-M brown-dwarfs claimed to be companions of the Upper-Scorpius stars USco161031.9-16191305, HIP77900, and HIP78530 using medium resolution spectroscopy at UV (R~3300), optical (R~5400), and near-infrared (R~4300) wavelengths. The spectra of six free-floating analogues from the same asso…

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   Frequent Optical Flares in an M-type Detached Eclipsing Binary TIC 349005337

   Xiao Zhou, Liying Zhu, Wei Hu et al. · 2026 · Solar and Stellar Astrophysics · AI summary available

   Frequent Optical Flares studies activity and eclipses in an M-dwarf binary, whereas this paper examines variable debris transits around a white dwarf.

   Abstract

   A comprehensive photometric and spectroscopic analysis of TIC 349005337, a highly active M-type detached eclipsing binary with an orbital period of 2.6079133 days, is presented utilizing high-cadence and long-term monitoring photometry from the Transiting Exoplanet Survey Satellite (TESS) and medium-resolution spectroscopy from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). By integrating radial velocity curves with light curves, we determined the fundamental physical parameters for both components. The system consists of an M-dwarf primary ($M_1 = 0.517 \pm 0.009 M_\odot$, $R_1 = 0.518 \pm 0.003 R_\odot$) and a fully convective secondary ($M_2 = 0.298 \pm 0.004 M_\o…