Search Publications
Star formation in IC1396: Kinematics and subcluster structure revealed by Gaia
Fang, Min; García-Álvarez, David; Kim, Jinyoung Serena +3 more
Aims: We investigate the star formation history of the IC1396 region by studying its kinematics and completing the population census.
Methods: We used multiwavelength data, combining optical spectroscopy to identify and classify new members and near-infrared photometry to trace shocks, jets, and outflows as well as the interactions betwe…
TITANS metal-poor reference stars. II. Red giants and CEMP stars
Valentini, M.; Chiappini, C.; Jorissen, A. +6 more
Context. Representative samples of F-, G-, K-type stars located outside of the solar neighbourhood have started to become available in spectroscopic surveys. The fraction of metal-poor ([Fe/H] ≲ −0.8 dex) giants becomes increasingly relevant towards greater distances. In metal-poor stars, effective temperatures (Teff) based on local the…
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep
Altamirano, D.; del Palacio, S.; García, F. +5 more
Context. Massive colliding-wind binaries (CWBs) can be non-thermal sources. The emission produced in their wind-collision region (WCR) encodes information of both the shock properties and the relativistic electrons accelerated in them. The recently discovered system Apep, a unique massive system hosting two Wolf-Rayet stars, is the most powerful s…
A Study of Stellar Spins in 15 Open Clusters
Schlaufman, Kevin C.; Healy, Brian F.; McCullough, P. R. +1 more
We analyze spectroscopic and photometric data to determine the projected inclinations of stars in 11 open clusters, placing constraints on the spin-axis distributions of six clusters. We combine these results with four additional clusters studied by Healy & McCullough and Healy et al. to perform an ensemble analysis of their spins. We find tha…
Spectroscopic Confirmation of a Population of Isolated, Intermediate-mass Young Stellar Objects
Zucker, Catherine; Hillenbrand, Lynne A.; Povich, Matthew S. +9 more
Wide-field searches for young stellar objects (YSOs) can place useful constraints on the prevalence of clustered versus distributed star formation. The Spitzer/IRAC Candidate YSO (SPICY) catalog is one of the largest compilations of such objects (~120,000 candidates in the Galactic midplane). Many SPICY candidates are spatially clustered, but, per…
WISDOM Project - XV. Giant molecular clouds in the central region of the barred spiral galaxy NGC 5806
Williams, Thomas G.; Cappellari, Michele; Davis, Timothy A. +7 more
We present high spatial resolution (≈24 pc) Atacama Large Millimeter/sub-millimeter Array 12CO(2-1) observations of the central region of the nearby barred spiral galaxy NGC 5806. NGC 5806 has a highly structured molecular gas distribution with a clear nucleus, a nuclear ring, and offset dust lanes. We identify 170 spatially and spectra…
Comprehensive Analysis of the Open Cluster Collinder 74
Yontan, Talar; Canbay, Remziye
In this study, we have used the Gaia Third Data Release (Gaia DR3) to investigate an intermediate-age open cluster Collinder 74. We have identified 102 probable cluster members by considering stars with a membership probability exceeding 0.5 and located within the designated confinement radius. The mean proper-motion components of Collinder 74 are…
Revising Properties of Planet-Host Binary Systems. III. There Is No Observed Radius Gap for Kepler Planets in Binary Star Systems
Huber, Daniel; Berger, Travis A.; Gaidos, Eric +7 more
Binary stars are ubiquitous; the majority of solar-type stars exist in binaries. Exoplanet occurrence rate is suppressed in binaries, but some multiples do still host planets. Binaries cause observational biases in planet parameters, with undetected multiplicity causing transiting planets to appear smaller than they truly are. We have analyzed the…
Small-scale loops heated to transition region temperatures and their chromospheric signatures in the simulated solar atmosphere
Leenaarts, J.; Danilovic, S.; Rempel, M. +2 more
Context. Recent observations have revealed loop-like structures at very small scales visible in observables that sample the transition region (TR) and even coronal temperatures. These structures are referred to as either `unresolved fine structures', `dynamic cool loops', `miniature hot loops' or `campfires' depending on the observables in which t…
TOI-1416: A system with a super-Earth planet with a 1.07 d period
Fridlund, M.; Pallé, E.; Guenther, E. W. +49 more
TOI-1416 (BD+42 2504, HIP 70705) is a V =10 late G- or early K-type dwarf star. TESS detected transits in its Sectors 16, 23, and 50 with a depth of about 455 ppm and a period of 1.07 days. Radial velocities (RVs) confirm the presence of the transiting planet TOI-1416 b, which has a mass of 3.48 ± 0.47 M⊕ and a radius of 1.62 ± 0.08 R