Search Publications
TIC 219006972: a compact, coplanar quadruple star system consisting of two eclipsing binaries with an outer period of 168 d
Kostov, Veselin B.; Powell, Brian P.; Rappaport, Saul A. +12 more
We present the discovery of a new highly compact quadruple star system, TIC 219006972, consisting of two eclipsing binary stars with orbital periods of 8.3 and 13.7 d, and an outer orbital period of only 168 d. This period is a full factor of 2 shorter than the quadruple with the shortest outer period reported previously, VW LMi, where the two bin…
VaTEST I: validation of sub-Saturn exoplanet TOI-181b in narrow orbit from its host star
Bieryla, Allyson; Esquerdo, Gilbert A.; Beichman, Charles A. +10 more
We present here a validation of sub-Saturn exoplanet TOI-181b orbiting a K spectral type star TOI-181 (mass: 0.822 ± 0.04 M⊙, radius: 0.745 ± 0.02 R⊙, temperature: 4994 ± 50 K) as a part of Validation of Transiting Exoplanets using Statistical Tools (VaTEST) project. TOI-181b is a planet with radius 6.95 ± 0.08 R⊕,…
A high-mass X-ray binary pulsar 4U 1907+09 with multiple absorption-line features in the spectrum
Tobrej, Mohammed; Rai, Binay; Ghising, Manoj +2 more
We report X-ray observations of the high mass X-ray binary (HMXB) pulsar 4U 1907+09. Spectral and timing analysis of the source has been performed using Nuclear Spectroscopic Telescope Array (NuSTAR) observation. Timing analysis of the photon events revealed the coherent X-ray pulsation of the source with a pulse period of 442.92 ± 0.03 s. It is o…
"Four new compact triply eclipsing triples found with Gaia and TESS
Rappaport, Saul A.; Borkovits, Tamás; Mitnyan, Tibor +2 more
This paper presents a comprehensive analysis of four triply eclipsing triple star systems, namely TIC 88206187, TIC 14839347, TIC 298714297, and TIC 66893949. The four systems with third-body eclipses were found in the TESS light curves from among a sample of ~400 matches between known eclipsing binaries and the Gaia DR3 Non-Single Star solution d…
Evolution of grain size distribution with enhanced abundance of small carbonaceous grains in galactic environments
Hirashita, Hiroyuki
We propose an updated dust evolution model that focuses on the grain size distribution in a galaxy. We treat the galaxy as a one-zone object and include five main processes (stellar dust production, dust destruction in supernova shocks, grain growth by accretion and coagulation, and grain disruption by shattering). In this paper, we improve the pr…
V618 Sgr: galactic eclipsing symbiotic nova detected in repeated outbursts
Merc, J.; Gális, R.; Garde, O. +9 more
V618 Sgr was previously classified as an R CrB-type variable and later as a possible symbiotic star. Our study aims to analyse the nature of this target, which is currently undergoing significant brightening in properties similar to those of known symbiotic novae. We analyse literature information, photometric observations, and 35 new optical spec…
A revised age greater than 50 Myr for the young cluster IC 4665
Jeffries, R. D.; Jackson, R. J.; Binks, A. S.
IC 4665 is one of only a dozen young open clusters with a 'lithium depletion boundary' (LDB) age. Using an astrometrically and spectroscopically filtered sample of cluster members, we show that both the positions of its low-mass stars in Gaia absolute colour-magnitude diagrams and the lithium depletion seen among its K- and early M-stars are disco…
The SCUBA-2 Cosmology Legacy Survey: the EGS deep field - III. The evolution of faint submillimetre galaxies at z < 4
Faber, S. M.; Aretxaga, I.; Montaña, A. +2 more
We present a demographic analysis of the physical and morphological properties of $450/850~\mu \rm m$-selected galaxies from the deep observations of the SCUBA-2 Cosmology Legacy Survey in the Extended Groth Strip that are detected below the classical submillimetre-galaxy regime ($S_{850\, \mu \rm m}\lesssim 6~\rm mJy$ beam-1) and compa…
CAPOS: the bulge Cluster APOgee Survey IV elemental abundances of the bulge globular cluster NGC 6558
Monachesi, Antonela; Beers, Timothy C.; Minniti, Dante +12 more
This study presents the results concerning six red giant stars members of the globular cluster NGC 6558. Our analysis utilized high-resolution near-infrared spectra obtained through the CAPOS initiative (the APOgee Survey of Clusters in the Galactic Bulge), which focuses on surveying clusters within the Galactic Bulge, as a component of the Apache…
KMT-2022-BLG-0440Lb: A new q < 10-4 microlensing planet with the central-resonant caustic degeneracy broken
Maoz, Dan; Han, Cheongho; Lee, Chung-Uk +58 more
We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived planetary signal was covered by both the KMTNet survey and follow-up observations. The binary-lens models with a central caustic provide the best fits, with a planet/host mass ratio, q = 0.75-1.00 × 1…