Eric Gaidos
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View article: ASASSN-24fw: An 8-month long, 4.1 mag, optically achromatic and polarized dimming event
ASASSN-24fw: An 8-month long, 4.1 mag, optically achromatic and polarized dimming event Open
We discuss ASASSN-24fw, a 13th-magnitude star that optically faded by mag starting in September 2024 after over a decade of quiescence in ASAS-SN. The dimmimg lasted $$8 months before returning to quiescence in late May 2025. The spectral…
View article: ASASSN-24fw: An 8-month long, 4.1 mag, optically achromatic and polarized dimming event
ASASSN-24fw: An 8-month long, 4.1 mag, optically achromatic and polarized dimming event Open
We discuss ASASSN-24fw, a 13th-magnitude star that optically faded by mag starting in September 2024 after over a decade of quiescence in ASAS-SN. The dimmimg lasted $$8 months before returning to quiescence in late May 2025. The s…
View article: Persistent Periodic Signals from 51 Peg in TESS Lightcurves
Persistent Periodic Signals from 51 Peg in TESS Lightcurves Open
Transiting Exoplanet Survey Satellite photometry of the archetypal main-sequence exoplanet host star 51 Peg in two 27 days sectors separated by 2 yr contains a 4.55 days periodic signal, distinct from the 4.23 orbit of the planet. The sign…
View article: Do accretion-powered stellar winds help spin down T Tauri stars?
Do accretion-powered stellar winds help spin down T Tauri stars? Open
How T Tauri stars remain slowly rotating while still accreting material is a long-standing puzzle. Current models suggest that these stars may lose angular momentum through magnetospheric ejections (MEs) of disk material and accretion-powe…
View article: Water-cooled (sub)-Neptunes get better gas mileage
Water-cooled (sub)-Neptunes get better gas mileage Open
The demographics of sub-Jovian planets around low-mass stars is dominated by populations of sub-Neptunes and super-Earths, distinguished by the presence or absence of envelopes of volatiles with a low molecular weight, that is, H 2 , He, a…
View article: The diversification and dissipation of protoplanetary disks
The diversification and dissipation of protoplanetary disks Open
Protoplanetary disk evolution exhibits trends with stellar mass, but also diversity of structure, and lifetime, with implications for planet formation and demographics. We show how varied outcomes can result from evolving structures in the…
View article: The Mass–Radius Relation for Planets in Binary Systems
The Mass–Radius Relation for Planets in Binary Systems Open
Stellar companion within a few hundred astronomical unit alter the structure and shorten the lifetime of protoplanetary disks, influencing planetary formation and evolution. Such systems host fewer close-in planets, and have fewer ~2.3 R ⊕…
View article: SPIRou observations of the young planet-hosting star PDS 70
SPIRou observations of the young planet-hosting star PDS 70 Open
This paper presents near-infrared spectropolarimetric and velocimetric observations of the young planet-hosting T Tauri star PDS 70, collected with SPIRou at the 3.6-m Canada–France–Hawaii Telescope from 2020 to 2024. Clear Zeeman signatur…
View article: The radius distribution of M dwarf-hosted planets and its evolution
The radius distribution of M dwarf-hosted planets and its evolution Open
M dwarf stars are the most promising hosts for detection and characterization of small and potentially habitable planets, and provide leverage relative to solar-type stars to test models of planet formation and evolution. Using Gaia astrom…
View article: Revising Properties of Planet–Host Binary Systems. IV. The Radius Distribution of Small Planets in Binary Star Systems Is Dependent on Stellar Separation*
Revising Properties of Planet–Host Binary Systems. IV. The Radius Distribution of Small Planets in Binary Star Systems Is Dependent on Stellar Separation* Open
Small planets ( R p ≤ 4 R ⊕ ) are divided into rocky super-Earths and gaseous sub-Neptunes separated by a radius gap, but the mechanisms that produce these distinct planet populations remain unclear. Binary stars are the only main-sequence…
View article: Investing in the Unrivaled Potential of Wide-Separation Sub-Jupiter Exoplanet Detection and Characterisation with JWST -- Strategic Exoplanet Initiatives with HST and JWST White Paper
Investing in the Unrivaled Potential of Wide-Separation Sub-Jupiter Exoplanet Detection and Characterisation with JWST -- Strategic Exoplanet Initiatives with HST and JWST White Paper Open
We advocate for a large scale imaging survey of nearby young moving groups and star-forming regions to directly detect exoplanets over an unexplored range of masses, ages and orbits. Discovered objects will be identified early enough in JW…
View article: An Earth-sized Planet on the Verge of Tidal Disruption
An Earth-sized Planet on the Verge of Tidal Disruption Open
TOI-6255 b (GJ 4256) is an Earth-sized planet (1.079 ± 0.065 R ⊕ ) with an orbital period of only 5.7 hr. With the newly commissioned Keck Planet Finder and CARMENES spectrographs, we determine the planet’s mass to be 1.44 ± 0.14 M ⊕ . The…
View article: TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target
TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target Open
We present an updated characterization of the TOI-1685 planetary system, which consists of a P b = 0.69 day ultra-short-period super-Earth planet orbiting a nearby ( d = 37.6 pc) M2.5V star (TIC 28900646, 2MASS J04342248+4302148). This pla…
View article: Climate change in hell: Long-term variation in transits of the evaporating planet K2-22b
Climate change in hell: Long-term variation in transits of the evaporating planet K2-22b Open
Context. Rocky planets on ultra-short period orbits can have surface magma oceans and rock-vapour atmospheres in which dust can condense. Observations of that dust can inform us about the composition and surface conditions on these objects…
View article: An Earth-sized Planet on the Verge of Tidal Disruption
An Earth-sized Planet on the Verge of Tidal Disruption Open
TOI-6255~b (GJ 4256) is an Earth-sized planet (1.079$\pm0.065$ $R_\oplus$) with an orbital period of only 5.7 hours. With the newly commissioned Keck Planet Finder (KPF) and CARMENES spectrographs, we determined the planet's mass to be 1.4…
View article: TOI-1685 b is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target
TOI-1685 b is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target Open
We present an updated characterization of the TOI-1685 planetary system, which consists of a P$_{\rm{b}}$ = 0.69\,day USP super-Earth planet orbiting a nearby ($d$ = 37.6\,pc) M2.5V star (TIC 28900646, 2MASS J04342248+4302148). This planet…
View article: The Dynamic, Chimeric Inner Disk of PDS 70
The Dynamic, Chimeric Inner Disk of PDS 70 Open
Transition disks, with inner regions depleted in dust and gas, could represent later stages of protoplanetary disk evolution when newly formed planets are emerging. The PDS 70 system has attracted particular interest because of the presenc…
View article: Comprehensive High-resolution Chemical Spectroscopy of Barnard’s Star with SPIRou
Comprehensive High-resolution Chemical Spectroscopy of Barnard’s Star with SPIRou Open
Determination of fundamental parameters of stars impacts all fields of astrophysics, from galaxy evolution to constraining the internal structure of exoplanets. This paper presents a detailed spectroscopic analysis of Barnard’s star (other…
View article: Transit spectroscopy of K2-33b with subaru/IRD: Spin-Orbit alignment and tentative atmospheric helium
Transit spectroscopy of K2-33b with subaru/IRD: Spin-Orbit alignment and tentative atmospheric helium Open
Exoplanets in their infancy are ideal targets to probe the formation and evolution history of planetary systems, including the planet migration and atmospheric evolution and dissipation. In this paper, we present spectroscopic observations…
View article: The Radius Distribution of M dwarf-hosted Planets and its Evolution
The Radius Distribution of M dwarf-hosted Planets and its Evolution Open
M dwarf stars are the most promising hosts for detection and characterization of small and potentially habitable planets, and provide leverage relative to solar-type stars to test models of planet formation and evolution. Using \emph{Gaia}…
View article: Transit Spectroscopy of K2-33b with Subaru/IRD: Spin-Orbit Alignment and Tentative Atmospheric Helium
Transit Spectroscopy of K2-33b with Subaru/IRD: Spin-Orbit Alignment and Tentative Atmospheric Helium Open
Exoplanets in their infancy are ideal targets to probe the formation and evolution history of planetary systems, including the planet migration and atmospheric evolution and dissipation. In this paper, we present spectroscopic observations…
View article: The Dynamic, Chimeric Inner Disk of PDS 70
The Dynamic, Chimeric Inner Disk of PDS 70 Open
Transition disks, with inner regions depleted in dust and gas, could represent later stages of protoplanetary disk evolution when newly-formed planets are emerging. The PDS 70 system has attracted particular interest because of the presenc…
View article: An Episode of Occultation Events in Gaia21bcv
An Episode of Occultation Events in Gaia21bcv Open
A previously unremarkable star near the Canis Major OB1/R1 association underwent an episode of multiple deep brightness minima. Light curves based on archival Gaia, Zwicky Transient Facility (ZTF), and NEOWISE data and additional observati…
View article: TOI-4860 b, a short-period giant planet transiting an M3.5 dwarf
TOI-4860 b, a short-period giant planet transiting an M3.5 dwarf Open
We report the discovery and characterisation of a giant transiting planet orbiting a nearby M3.5V dwarf ( d = 80.4pc, G = 15.1 mag, K =11.2mag, R * = 0.358 ± 0.015 R ⊙ , M * = 0.340 ± 0.009 M ⊙ ). Using the photometric time series from TES…
View article: Revisiting the membership, multiplicity, and age of the Beta Pictoris Moving Group in the <i>Gaia</i> era
Revisiting the membership, multiplicity, and age of the Beta Pictoris Moving Group in the <i>Gaia</i> era Open
Determining the precise ages of young (tens to a few hundred Myr) kinematic (‘moving’) groups is important for placing star, protoplanetary disc, and planet observations on an evolutionary timeline. The nearby ∼25 Myr-old β Pictoris Moving…
View article: An Episode of Occultation Events in Gaia21bcv
An Episode of Occultation Events in Gaia21bcv Open
A previously unremarkable star near the Canis Major OB1/R1 association underwent an episode of multiple deep brightness minima. Light curves based on archival Gaia, ZTF, NEOWISE data and additional observations from LCO and UKIRT show that…
View article: Revisiting the Membership, Multiplicity, and Age of the Beta Pictoris Moving Group in the Gaia Era
Revisiting the Membership, Multiplicity, and Age of the Beta Pictoris Moving Group in the Gaia Era Open
Determining the precise ages of young (tens to a few hundred Myr) kinematic (``moving") groups is important for placing star, protoplanetary disk, and planet observations on an evolutionary timeline. The nearby $\sim$25 Myr-old $β$ Pictori…
View article: Validating AU Microscopii d with Transit Timing Variations
Validating AU Microscopii d with Transit Timing Variations Open
AU Mic is a young (22 Myr), nearby exoplanetary system that exhibits excess transit timing variations (TTVs) that cannot be accounted for by the two known transiting planets nor stellar activity. We present the statistical “validation” of …
View article: Comprehensive High-resolution Chemical Spectroscopy of Barnard's Star with SPIRou
Comprehensive High-resolution Chemical Spectroscopy of Barnard's Star with SPIRou Open
Determination of fundamental parameters of stars impacts all fields of astrophysics, from galaxy evolution to constraining the internal structure of exoplanets. This paper presents a detailed spectroscopic analysis of Barnard's star that c…
View article: CO, H$_2$O, and CH$_4$ in the Dusty Atmosphere of a $\le$5 Myr-old Exoplanet
CO, H$_2$O, and CH$_4$ in the Dusty Atmosphere of a $\le$5 Myr-old Exoplanet Open
Very young massive planets are sufficiently luminous by their internal heat of formation to permit detailed studies, including spectroscopy of their atmospheres with large telescopes at sufficient resolution ($λ/ Δλ\gtrsim 1000$) to identi…