Search Publications
Six new compact triply eclipsing triples found with TESS
Mitnyan, T.; Pál, A.; Vanderburg, A. +21 more
In this work, we report the discovery and analysis of six new compact triply eclipsing triple star systems found with the TESS mission: TICs 37743815, 42565581, 54060695, 178010808, 242132789, and 456194776. All of these exhibit distinct third-body eclipses where the inner eclipsing binary (EB) occults the third ('tertiary') star, or vice versa. W…
The Rapid X-Ray and UV Evolution of ASASSN-14ko
Lin, Chien-Cheng; Holoien, Thomas W. -S.; Auchettl, Katie +13 more
ASASSN-14ko is a recently discovered periodically flaring transient at the center of the active galactic nucleus (AGN) ESO 253-G003 with a slowly decreasing period. Here, we show that the flares originate from the northern, brighter nucleus in this dual-AGN, post-merger system. The light curves for the two flares that occurred in 2020 May and Sept…
Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS
Guterman, P.; Alonso, R.; Deleuil, M. +115 more
We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data with TESS and CHEOPS photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our joint analysis confirms the presence of four transiting planets, namely TOI-561 b (P = 0.45 d, R = 1.42 R⊕, M = 2.0 M⊕)…
Shock cooling of a red-supergiant supernova at redshift 3 in lensed images
Filippenko, Alexei V.; Kelly, Patrick L.; Oguri, Masamune +6 more
The core-collapse supernova of a massive star rapidly brightens when a shock, produced following the collapse of its core, reaches the stellar surface. As the shock-heated star subsequently expands and cools, its early-time light curve should have a simple dependence on the size of the progenitor1 and therefore final evolutionary state.…
The evolution of CNO elements in galaxies
Romano, Donatella
After hydrogen and helium, oxygen, carbon, and nitrogen—hereinafter, the CNO elements—are the most abundant species in the universe. They are observed in all kinds of astrophysical environments, from the smallest to the largest scales, and are at the basis of all known forms of life, hence, the constituents of any biomarker. As such, their study p…
PHANGS-HST: new methods for star cluster identification in nearby galaxies
White, Richard L.; Kruijssen, J. M. Diederik; Rosolowsky, Erik +14 more
We present an innovative and widely applicable approach for the detection and classification of stellar clusters, developed for the PHANGS-HST Treasury Program, an NUV-to-I band imaging campaign of 38 spiral galaxies. Our pipeline first generates a unified master source list for stars and candidate clusters, to enable a self-consistent inventory o…
Discovery of post-mass-transfer helium-burning red giants using asteroseismology
Wu, Yaqian; Bi, Shaolan; Li, Yaguang +14 more
A star expands to become a red giant when it has fused all the hydrogen in its core into helium. If the star is in a binary system, its envelope can overflow onto its companion or be ejected into space, leaving a hot core and potentially forming a subdwarf B star1-3. However, most red giants that have partially transferred envelopes in …
A likely flyby of binary protostar Z CMa caught in action
Henning, Thomas; Dong, Ruobing; Pyo, Tae-Soo +16 more
Close encounters between young stellar objects in star-forming clusters are expected to markedly perturb circumstellar disks. Such events are witnessed in numerical simulations of star formation1-3, but few direct observations of ongoing encounters have been made. Here we report sub-0.1″-resolution Atacama Large Millimeter/Submillimeter…
Systematic KMTNet planetary anomaly search. V. Complete sample of 2018 prime-field
Stassun, Keivan G.; Han, Cheongho; Udalski, Andrzej +69 more
We complete the analysis of all 2018 prime-field microlensing planets identified by the Korea Microlensing Telescope Network (KMTNet) Anomaly Finder. Among the ten previously unpublished events with clear planetary solutions, eight are either unambiguously planetary or are very likely to be planetary in nature: OGLE-2018-BLG-1126, KMT-2018-BLG-200…
Tracing the Milky Way warp and spiral arms with classical Cepheids
Kovtyukh, V.; Lemasle, B.; Kniazev, A. +10 more
Context. Mapping the Galactic spiral structure is a difficult task since the Sun is located in the Galactic plane and because of dust extinction. For these reasons, molecular masers in radio wavelengths have been used with great success to trace the Milky Way spiral arms. Recently, Gaia parallaxes have helped in investigating the spiral structure …