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NICER Observation of the Temporal and Spectral Evolution of Swift J1818.0-1607: A Missing Link between Magnetars and Rotation-powered Pulsars
Enoto, Teruaki; Sakamoto, Takanori; Ray, Paul S. +13 more
We report on the hard X-ray burst and the first ∼100 days of NICER monitoring of the soft X-ray temporal and spectral evolution of the newly discovered magnetar Swift J1818.0-1607. The burst properties are typical of magnetars with a duration of T90 = 10 ± 4 ms and a temperature of kT = 8.4 ± 0.7 keV. The 2-8 keV pulse shows a broad, si…
Frequency of Planets in Binaries
Bonavita, Mariangela; Desidera, Silvano
The frequency of planets in binaries is an important issue in the field of extrasolar planet studies because of its relevance in the estimation of the global planet population of our galaxy and the clues it can give to our understanding of planet formation and evolution. Multiple stars have often been excluded from exoplanet searches, especially t…
Observed binary populations reflect the Galactic history. Explaining the orbital period-mass ratio relation in wide hot subdwarf binaries
Bobrick, A.; Vučković, M.; Vos, J.
Context. Wide hot subdwarf B (sdB) binaries with main-sequence companions are outcomes of stable mass transfer from evolved red giants. The orbits of these binaries show a strong correlation between their orbital periods and mass ratios. The origins of this correlation have, so far, been lacking a conclusive explanation.
Aims: We aim to find …
SuperBoRG: Exploration of Point Sources at z ∼ 8 in HST Parallel Fields
Treu, T.; Mason, C. A.; Trenti, M. +7 more
To extend the search for quasars in the epoch of reionization beyond the tip of the luminosity function, we explore point-source candidates at redshift z ∼ 8 in SuperBoRG, a compilation of ∼0.4 deg2 archival medium-deep (mF160W ∼ 26.5 ABmag, 5σ) parallel infrared (IR) images taken with the Hubble Space Telescope (HST). Initia…
A Second Look at 12 Candidate Dual AGNs Using BAYMAX
Greene, Jenny E.; Comerford, Julia M.; Barrows, R. Scott +5 more
We present an analysis of 12 optically selected dual active galactic nucleus (AGN) candidates at z < 0.34. Each candidate was originally identified via double-peaked [O III] λ5007 emission lines and received follow-up Chandra and Hubble Space Telescope (HST) observations. Because the X-ray data are low-count (<100 counts) with small separati…
NGTS-10b: the shortest period hot Jupiter yet discovered
Smalley, Barry; Jackman, James A. G.; Wheatley, Peter J. +44 more
We report the discovery of a new ultrashort period (USP) transiting hot Jupiter from the Next Generation Transit Survey (NGTS). NGTS-10b has a mass and radius of 2.162 ^{+0.092}_{-0.107} MJ and 1.205 ^{+0.117}_{-0.083} RJ and orbits its host star with a period of 0.7668944 ± 0.0000003 d, making it the shortest period hot Jupi…
The Lyman Continuum Escape Fraction of Galaxies and AGN in the GOODS Fields
Koekemoer, Anton M.; Conselice, Christopher J.; Hathi, Nimish +13 more
We present our analysis of the Lyman continuum (LyC) emission and escape fraction of 111 spectroscopically verified galaxies with and without active galactic nuclei (AGN) from 2.26 < z < 4.3. We extended our ERS sample from Smith et al. with 64 galaxies in the GOODS North and South fields using WFC3/UVIS F225W, F275W, and F336W mosaics we in…
Microlensing Optical Depth and Event Rate in the OGLE-IV Galactic Plane Fields
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +10 more
Searches for gravitational microlensing events are traditionally concentrated on the central regions of the Galactic bulge but many microlensing events are expected to occur in the Galactic plane, far from the Galactic Center. Owing to the difficulty in conducting high-cadence observations of the Galactic plane over its vast area, which are necess…
The Chemical Signatures of Planetary Engulfment Events in Binary Systems
Nagar, Tushar; Spina, Lorenzo; Karakas, Amanda I.
Planetary engulfment events involve the chemical assimilation of a planet into a star’s external layer. This can cause a change in the chemical pattern of the stellar atmosphere in a way that mirrors the composition of the rocky object engulfed, with the refractory elements being more abundant than the volatiles. Due to these stellar chemical chan…
HATS-71b: A Giant Planet Transiting an M3 Dwarf Star in TESS Sector 1
Kim, J.; Butler, R. P.; Winn, J. N. +41 more
We report the discovery of HATS-71b, a transiting gas giant planet on a $P=3.7955$ day orbit around a $G=15.35$ mag M3 dwarf star. HATS-71 is the coolest M dwarf star known to host a hot Jupiter. The loss of light during transits is 4.7%, more than in any other confirmed transiting planet system. The planet was identified as a candidate by the gro…