1.5k citations · 11.8k across the 198 of their papers we have counts for
103 papers · 1 filter
Measuring the Temperature of Starspots from Multi-Filter Photometry
Maria C. Schutte, Leslie Hebb, John P. Wisniewski +5
Using simultaneous multi-filter observations during the transit of an exoplanet around a K dwarf star, we determine the temperature of a starspot through modeling the radius and po…
A Seven-Day Multi-Wavelength Flare Campaign on AU Mic I: High-Time Resolution Light Curves and the Thermal Empirical Neupert Effect
Isaiah I. Tristan, Yuta Notsu, Adam F. Kowalski +13
We present light curves and flares from a seven day, multi-wavelength observational campaign of AU Mic, a young and active dM1e star with exoplanets and a debris disk. We report on…
Chandra Observations of Six Peter Pan Disks: Diversity of X-ray-driven Internal Photoevaporation Rates Doesn't Explain Their Rare Longevity
E. Laos, J. P. Wisniewski, M. J. Kuchner +6
We present Chandra X-ray observations of 6 previously-identified Peter Pan objects, rare 40 Myr systems with evidence of primordial disk retention. We observe X-ray luminosities (0…
Direct Imaging Discovery and Dynamical Mass of a Substellar Companion Orbiting an Accelerating Hyades Sun-like Star with SCExAO/CHARIS
Masayuki Kuzuhara, Thayne Currie, Takuya Takarada +33
We present the direct-imaging discovery of a substellar companion in orbit around a Sun-like star member of the Hyades open cluster. So far, no other substellar companions have bee…
Disks in Nearby Young Stellar Associations Found Via Virtual Reality
Susan Higashio, Marc J. Kuchner, Steven M. Silverberg +24
The Disk Detective citizen science project recently released a new catalog of disk candidates found by visual inspection of images from NASA's Wide-Field Infrared Survey Explorer (…
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…
Monitoring inner regions in the RY Tau jet
Taichi Uyama, Michihiro Takami, Gabriele Cugno +18
We present multi-epoch observations of the RY~Tau jet for H and [\ion{Fe}{2}] 1.644 \micron~emission lines obtained with Subaru/SCExAO+VAMPIRES, Gemini/NIFS, and Keck/OSIRIS in…
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…
Outbursts and stellar properties of the classical Be star HD 6226
Noel D. Richardson, Olivier Thizy, Jon E. Bjorkman +58
The bright and understudied classical Be star HD 6226 has exhibited multiple outbursts in the last several years during which the star grew a viscous decretion disk. We analyze 659…
New Candidate Extreme T Subdwarfs from the Backyard Worlds: Planet 9 Citizen Science Project
Aaron M. Meisner, Adam C. Schneider, Adam J. Burgasser +29
Schneider et al. (2020) presented the discovery of WISEA J041451.67-585456.7 and WISEA J181006.18-101000.5, which appear to be the first examples of extreme T-type subdwarfs (esdTs…
Variability of Disk Emission in Pre-Main Sequence and related Stars. V. Occultation Events from the innermost disk region of the Herbig Ae Star HD 163296
Monika Pikhartova, Zachary C. Long, Korash D. Assani +8
HD 163296 is a Herbig Ae star that underwent a dramatic 0.8 magnitude drop in brightness in the V photometric band in 2001 and a brightening in the near-IR in 2002. Because t…
Characterization of M dwarfs Using Optical Mid-Resolution Spectra for Exploration of Small Exoplanets
Yohei Koizumi, Masayuki Kuzuhara, Masashi Omiya +4
We present the optical spectra of 338 nearby M dwarfs, and compute their spectral types, effective temperatures (), and radii. Our spectra have been obtained usin…
SCExAO/CHARIS Direct Imaging Discovery of a 20 au Separation, Low-Mass Ratio Brown Dwarf Companion to an Accelerating Sun-like Star
Thayne Currie, Timothy D. Brandt, Masayuki Kuzuhara +27
We present the direct imaging discovery of a substellar companion to the nearby Sun-like star, HD 33632 Aa, at a projected separation of 20 au, obtained with SCExAO/CHARIS i…
Disk Illumination and Jet Variability of the Herbig Ae Star HD 163296 Using Multi-Epoch HST/STIS Optical, Near-IR, and Radio Imagery and Spectroscopy
Evan A. Rich, John P. Wisniewski, Michael L. Sitko +3
We present two new epochs of Hubble Space Telescope/Space Telescope Imaging Spectrograph coronagraphic imaging, along with multi-epoch optical, near-IR, and radio monitoring, of th…
Spitzer Follow-up of Extremely Cold Brown Dwarfs Discovered by the Backyard Worlds: Planet 9 Citizen Science Project
Aaron M. Meisner, Jacqueline K. Faherty, J. Davy Kirkpatrick +40
We present Spitzer follow-up imaging of 95 candidate extremely cold brown dwarfs discovered by the Backyard Worlds: Planet 9 citizen science project, which uses visually perceived…
13 Years of P Cygni Spectropolarimetry: Investigating Mass-loss Through H, Periodicity, and Ellipticity
Keyan Gootkin, Trevor Dorn-Wallenstein, Jamie R. Lomax +7
We report on over 13 years of optical and near-ultraviolet spectropolarimetric observations of the famous Luminous Blue Variable (LBV), P Cygni. LBVs are a critical transitional ph…
Discovery of a Nearby Young Brown Dwarf Disk
M. C. Schutte, K. D. Lawson, J. P. Wisniewski +15
We report the discovery of the youngest brown dwarf with a disk at 102 pc from the Sun, WISEA~J120037.79-784508.3 (W1200-7845), via the Disk Detective citizen science project. We e…
WISEA J083011.95+283716.0: A Missing Link Planetary-Mass Object
Daniella C. Bardalez Gagliuffi, Jacqueline K. Faherty, Adam C. Schneider +16
We present the discovery of WISEA J083011.95+283716.0, the first Y dwarf candidate identified through the Backyard Worlds: Planet 9 citizen science project. We identified this obje…
Peter Pan Disks: Long-lived Accretion Disks Around Young M Stars
Steven M. Silverberg, John P. Wisniewski, Marc J. Kuchner +12
WISEA J080822.18-644357.3, an M star in the Carina association, exhibits extreme infrared excess and accretion activity at an age greater than the expected accretion disk lifetime.…
The Hubble Space Telescope Advanced Camera for Surveys Emission Line Survey of Andromeda. I: Classical Be Stars
M. Peters, J. P. Wisniewski, B. F. Williams +9
We present results from a 2-epoch HST H emission line survey of the Andromeda Galaxy that overlaps the footprint of the Panchromatic Hubble Andromeda Treasury (PHAT) survey. We…
High-Resolution Near-Infrared Polarimetry and Sub-Millimeter Imaging of FS Tau A: Possible Streamers in Misaligned Circumbinary Disk System
Yi Yang, Eiji Akiyama, Thayne Currie +56
We analyzed the young (2.8-Myr-old) binary system FS Tau A using near-infrared (H-band) high-contrast polarimetry data from Subaru/HiCIAO and sub-millimeter CO (J=2-1) line emissio…
SUBARU Near-Infrared Imaging Polarimetry of Misaligned Disks Around The SR24 Hierarchical Triple System
Satoshi Mayama, Sebastián Pérez, Nobuhiko Kusakabe +65
The SR24 multi-star system hosts both circumprimary and circumsecondary disks, which are strongly misaligned from each other. The circumsecondary disk is circumbinary in nature. In…
High Fidelity Imaging of the Inner AU Mic Debris Disk: Evidence of Differential Wind Sculpting?
John P. Wisniewski, Adam F. Kowalski, James R. A. Davenport +17
We present new high fidelity optical coronagraphic imagery of the inner 50 au of AU Mic's edge-on debris disk using the BAR5 occulter of the Hubble Space Telescope Imaging Sp…
Identification of Stellar Flares Using Differential Evolution Template Optimization
Kellen D. Lawson, John P. Wisniewski, Eric C. Bellm +2
We explore methods for the identification of stellar flare events in irregularly sampled data of ground-based time domain surveys. In particular, we describe a new technique for id…