114 citations · 731 across the 22 of their papers we have counts for
22 papers
The Evryscope Fast Transient Engine: Real-Time Detection for Rapidly Evolving Transients
Hank Corbett, Jonathan Carney, Ramses Gonzalez +8
Astrophysical transients with rapid development on sub-hour timescales are intrinsically rare. Due to their short durations, events like stellar superflares, optical flashes from g…
Low-Cost Access to the Deep, High-Cadence Sky: the Argus Optical Array
Nicholas M. Law, Hank Corbett, Nathan W. Galliher +16
New mass-produced, wide-field, small-aperture telescopes have the potential to revolutionize ground-based astronomy by greatly reducing the cost of collecting area. In this paper,…
Rotation periods of TESS Objects of Interest from the Magellan-TESS Survey with multiband photometry from Evryscope and TESS
Ward S. Howard, Johanna Teske, Hank Corbett +8
Stellar RV jitter due to surface activity may bias the RV semi-amplitude and mass of rocky planets. The amplitude of the jitter may be estimated from the uncertainty in the rotatio…
Revisiting the HD 21749 Planetary System with Stellar Activity Modeling
Tianjun Gan, Sharon Xuesong Wang, Johanna K. Teske +26
HD 21749 is a bright ( mag) K dwarf at 16 pc known to host an inner terrestrial planet HD 21749c as well as an outer sub-Neptune HD 21749b, both delivered by TESS. Follow-up…
Orbital Foregrounds for Ultra-Short Duration Transients
Hank Corbett, Nicholas M. Law, Alan Vasquez Soto +7
Reflections from objects in Earth orbit can produce sub-second, star-like optical flashes similar to astrophysical transients. Reflections have historically caused false alarms for…
EvryFlare III: Temperature Evolution and Habitability Impacts of Dozens of Superflares Observed Simultaneously by Evryscope and TESS
Ward S. Howard, Hank Corbett, Nicholas M. Law +8
Superflares may provide the dominant source of biologically relevant UV radiation to rocky habitable zone M-dwarf planets (M-Earths), altering planetary atmospheres and conditions…
EVR-CB-004: An Inflated Hot Subdwarf O star + Unseen WD Companion in a Compact Binary Discovered with the Evryscope
Jeffrey K. Ratzloff, Thomas Kupfer, Brad N. Barlow +10
We present the discovery of EVR-CB-004, a close binary with a remnant stellar core and an unseen white dwarf companion. The analysis in this work reveals the primary is potentially…
Automatic Translation of tock-CSP into Timed Automata
Abdulrazaq Abba, Ana Cavalcanti, Jeremy Jacob
The process algebra tock-CSP provides textual notations for modelling discrete-time behaviours, with the support of various tools for verification. Similarly, automatic verificatio…
Multi-wavelength Photometry and Progenitor Analysis of the Nova V906 Car
Jerrick Wee, Nadejda Blagorodnova, Bryan Edward Penprase +12
We present optical and infrared photometry of the classical nova V906 Car, also known as Nova Car 2018 and ASASSN-18fv, discovered by ASASS-SN survey on 16.32 March 2018 UT (MJD 58…
Evryscope and K2 Constraints on TRAPPIST-1 Superflare Occurrence and Planetary Habitability
Amy L. Glazier, Ward S. Howard, Hank Corbett +4
The nearby ultracool dwarf TRAPPIST-1 possesses several Earth-sized terrestrial planets, three of which have equilibrium temperatures that may support liquid surface water, making…
The Robotilter: An Automated Lens / CCD Alignment System for the Evryscope
Jeffrey K. Ratzloff, Nicholas M. Law, Henry T. Corbett +2
Camera lenses are increasingly used in wide-field astronomical surveys due to their high performance, wide field-of-view (FOV) unreachable from traditional telescope optics, and mo…
Hot Subdwarf All Southern Sky Fast Transit Survey with the Evryscope
Jeffrey K. Ratzloff, Brad N. Barlow, Peter Nemeth +6
We have conducted a survey of candidate hot subdwarf stars in the southern sky searching for fast transits, eclipses, and sinusoidal like variability in the Evryscope light curves.…
EVR-CB-001: An evolving, progenitor, white dwarf compact binary discovered with the Evryscope
Jeffrey K. Ratzloff, Brad N. Barlow, Thomas Kupfer +7
We present EVR-CB-001, the discovery of a compact binary with an extremely low mass () helium core white dwarf progenitor (pre-He WD) and an unseen low mass…
EvryFlare II: Rotation Periods of the Cool Flare Stars in TESS Across Half the Southern Sky
Ward S. Howard, Hank Corbett, Nicholas M. Law +6
We measure rotation periods and sinusoidal amplitudes in Evryscope light curves for 122 two-minute K5-M4 TESS targets selected for strong flaring. The Evryscope array of telescopes…
Variables in the Southern Polar Region Evryscope 2016 Dataset
Jeffrey K. Ratzloff, Henry T. Corbett, Nicholas M. Law +6
The regions around the celestial poles offer the ability to find and characterize long-term variables from ground-based observatories. We used multi-year Evryscope data to search f…
Building the Evryscope: Hardware Design and Performance
Jeffrey K. Ratzloff, Nicholas M. Law, Octavi Fors +4
The Evryscope is a telescope array designed to open a new parameter space in optical astronomy, detecting short timescale events across extremely large sky areas simultaneously. Th…
EvryFlare I: Long-term Evryscope Monitoring of Flares from the Cool Stars Across Half the Southern Sky
Ward S. Howard, Hank Corbett, Nicholas M. Law +5
We search for superflares from 4,068 cool stars in 2+ years of Evryscope photometry, focusing on those with high-cadence data from both Evryscope and TESS. The Evryscope array of s…
Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits
Molly R. Kosiarek, Ian J. M. Crossfield, Kevin K. Hardegree-Ullman +36
We report improved masses, radii, and densities for four planets in two bright M-dwarf systems, K2-3 and GJ3470, derived from a combination of new radial velocity and transit obser…
Young and eccentric: the quadruple system HD 86588
Andrei Tokovinin, Hank Corbett, Octavi Fors +4
High-resolution spectroscopy and speckle interferometry reveal the young star HD 86588 as a quadruple system with a 3-tier hierarchy. The 0.3" resolved binary A,B with an estimated…
The First Naked-Eye Superflare Detected from Proxima Centauri
Ward S. Howard, Matt A. Tilley, Hank Corbett +11
Proxima b is a terrestrial-mass planet in the habitable-zone of Proxima Centauri. Proxima Centauri's high stellar activity however casts doubt on the habitability of Proxima b: suf…
Evryscope science: exploring the potential of all-sky gigapixel-scale telescopes
Nicholas M. Law, Octavi Fors, Jeffrey Ratzloff +11
Low-cost mass-produced sensors and optics have recently made it feasible to build telescope arrays which observe the entire accessible sky simultaneously. In this article we discus…
The Evryscope: the first full-sky gigapixel-scale telescope
Nicholas M. Law, Octavi Fors, Philip Wulfken +2
Current time-domain wide-field sky surveys generally operate with few-degree-sized fields and take many individual images to cover large sky areas each night. We present the design…