Search Publications
Hubble Space Telescope Observations of Mira Variables in the SN Ia Host NGC 1559: An Alternative Candle to Measure the Hubble Constant
Casertano, Stefano; Filippenko, Alexei V.; Riess, Adam G. +7 more
We present year-long, near-infrared Hubble Space Telescope (HST) WFC3 observations used to search for Mira variables in NGC 1559, the host galaxy of the Type Ia supernova (SN Ia) SN 2005df. This is the first dedicated search for Miras, highly evolved low-mass stars, in an SN Ia host, and subsequently the first calibration of the SN Ia luminosity u…
The Solar Orbiter magnetometer
Russell, C. T.; Forsyth, R.; Müller, D. +49 more
The magnetometer instrument on the Solar Orbiter mission is designed to measure the magnetic field local to the spacecraft continuously for the entire mission duration. The need to characterise not only the background magnetic field but also its variations on scales from far above to well below the proton gyroscale result in challenging requiremen…
A planet within the debris disk around the pre-main-sequence star AU Microscopii
Barclay, Thomas; Vanderburg, Andrew; Hellier, Coel +84 more
AU Microscopii (AU Mic) is the second closest pre-main-sequence star, at a distance of 9.79 parsecs and with an age of 22 million years1. AU Mic possesses a relatively rare2 and spatially resolved3 edge-on debris disk extending from about 35 to 210 astronomical units from the star4, and with clumps exhib…
Planetary nebulae seen with TESS: Discovery of new binary central star candidates from Cycle 1
Lillo-Box, J.; Jones, D.; Miranda, L. F. +2 more
Context. It has become clear in recent years that binarity plays a crucial role in many aspects of planetary nebulae (PNe), particularly with regard to the striking morphologies they exhibit. To date, there are nearly 60 known binary central stars of PNe (bCSPNe). However, both theory and observation indicate that this figure represents only the t…
SOAR TESS Survey. I. Sculpting of TESS Planetary Systems by Stellar Companions
Ziegler, Carl; Tokovinin, Andrei; Mann, Andrew W. +3 more
The Transiting Exoplanet Survey Satellite (TESS) is finding transiting planet candidates around bright, nearby stars across the entire sky. The large field of view, however, results in low spatial resolution; therefore, multiple stars contribute to almost every TESS light curve. High angular resolution imaging can detect the previously unknown com…
A compendium of distances to molecular clouds in the Star Formation Handbook
Alves, João; Speagle, Joshua S.; Zucker, Catherine +4 more
Accurate distances to local molecular clouds are critical for understanding the star and planet formation process, yet distance measurements are often obtained inhomogeneously on a cloud-by-cloud basis. We have recently developed a method that combines stellar photometric data with Gaia DR2 parallax measurements in a Bayesian framework to infer th…
Cosmography in f (Q ) gravity
Wang, Deng; Sahoo, P. K.; Mandal, Sanjay
Cosmography is an ideal tool to investigate the cosmic expansion history of the Universe in a model-independent way. The equations of motion in modified theories of gravity are usually very complicated; cosmography may select practical models without imposing arbitrary choices a priori. We use the model-independent way to derive f (z ) and its der…
Neutrino and Positron Constraints on Spinning Primordial Black Hole Dark Matter
Ray, Anupam; Laha, Ranjan; Dasgupta, Basudeb
Primordial black holes can have substantial spin—a fundamental property that has a strong effect on its evaporation rate. We conduct a comprehensive study of the detectability of primordial black holes with non-negligible spin, via the searches for the neutrinos and positrons in the MeV energy range. Diffuse supernova neutrino background searches …
Impact of space weather on climate and habitability of terrestrial-type exoplanets
Luhmann, J. G.; France, K.; Verkhoglyadova, O. P. +44 more
The search for life in the Universe is a fundamental problem of astrobiology and modern science. The current progress in the detection of terrestrial-type exoplanets has opened a new avenue in the characterization of exoplanetary atmospheres and in the search for biosignatures of life with the upcoming ground-based and space missions. To specify t…
A lack of evolution in the very bright end of the galaxy luminosity function from z ≃ 8 to 10
Bowler, R. A. A.; McLure, R. J.; Dunlop, J. S. +5 more
We utilize deep near-infrared survey data from the UltraVISTA fourth data release (DR4) and the VIDEO survey, in combination with overlapping optical and Spitzer data, to search for bright star-forming galaxies at z ≳ 7.5. Using a full photometric redshift fitting analysis applied to the ∼6 deg^2 of imaging searched, we find 27 Lyman break galaxie…