Search Publications
What's Behind the Elephant's Trunk? Identifying Young Stellar Objects on the Outskirts of IC 1396
Principe, David A.; Wolk, Scott J.; Kim, Jinyoung Serena +2 more
Empirically, the estimated lifetime of a typical protoplanetary disk is <5-10 Myr. However, the disk lifetimes required to produce a variety of observed exoplanetary systems may exceed this timescale. Some hypothesize that this inconsistency is due to estimating disk fractions at the cores of clusters, where radiation fields external to a star-…
Detached Shell Carbon Stars: Tracing Thermal Pulses on the Asymptotic Giant Branch
Kastner, Joel H.; Wilson, Emily
We consider whether the subset of carbon-rich asymptotic giant branch (AGB) stars that exhibit detached, expanding circumstellar shells may reveal the past histories of these stars as having undergone helium shell flashes (thermal pulses) on the AGB. We exploit newly available Gaia parallaxes and photometry, along with archival infrared photometry…
Validation of HD 183579b Using Archival Radial Velocities: A Warm Neptune Orbiting a Bright Solar Analog
Kipping, David; Palatnick, Skyler; Yahalomi, Daniel
As exoplanetary science matures into its third decade, we are increasingly offered the possibility of pre-existing, archival observations for newly detected candidates. This is particularly poignant for the TESS mission, whose survey spans bright, nearby dwarf stars in both hemispheres—precisely the types of sources targeted by previous radial vel…
A massive open cluster hiding in full sight
Chené, A. -N.; Negueruela, I.; Tabernero, H. M. +4 more
Obscuration and confusion conspire to limit our knowledge of the inner Milky Way. Even at moderate distances, the identification of stellar systems becomes compounded by the extremely high density of background sources. Here, we provide a very revealing example of these complications by unveiling a large, massive, young cluster in the Sagittarius …
The Double-bubble Coronal Mass Ejection of the 2020 December 14 Total Solar Eclipse
Druckmüller, Miloslav; Boe, Benjamin; Habbal, Shadia +1 more
Total solar eclipses (TSEs) continue to provide an invaluable platform for exploring the magnetic topology of the solar corona and for studying dynamic events such as coronal mass ejections (CMEs)with a higher spatial resolution over a larger spatially continuous extent than is possible to achieve with any other method at present. In this Letter, …
The JCMT BISTRO-2 Survey: The Magnetic Field in the Center of the Rosette Molecular Cloud
Pattle, Kate; Karoly, Janik; Ward-Thompson, Derek +33 more
We present the first 850 µm polarization observations in the most active star-forming site of the Rosette Molecular Cloud (d ∼ 1.6 kpc) in the wall of the Rosette Nebula, imaged with the SCUBA-2/POL-2 instruments of the James Clerk Maxwell telescope, as part of the B-Fields In Star-forming Region Observations 2 (BISTRO-2) survey. From the PO…
HD 219134 Revisited: Planet d Transit Upper Limit and Planet f Transit Nondetection with ASTERIA and TESS
Vanderburg, Andrew; Latham, David W.; Schlieder, Joshua E. +38 more
HD 219134 is a K3V dwarf star with six reported radial-velocity discovered planets. The two innermost planets b and c show transits, raising the possibility of this system to be the nearest (6.53 pc), brightest (V = 5.57) example of a star with a compact multiple transiting planet system. Ground-based searches for transits of planets beyond b and …
Reconstruction of Magnetospheric Storm Time Dynamics Using Cylindrical Basis Functions and Multi Mission Data Mining
Sitnov, M. I.; Tsyganenko, N. A.; Andreeva, V. A.
First results are presented of the modeling of magnetospheric storm events, based on: (i) a new method to represent the magnetic field by means of the so called cylindrical basis functions, (ii) the data mining approach by Sitnov et al. (2008); https://doi.org/10.1029/2007ja013003, and (iii) upgra…
The role of SPICA-like missions and the Origins Space Telescope in the quest for heavily obscured AGN and synergies with Athena
Pozzi, F.; Rodighiero, G.; Feltre, A. +21 more
In the black hole (BH)-galaxy co-evolution framework, most of the star formation (SF) and the BH accretion are expected to take place in highly obscured conditions. The large amount of gas and dust absorbs most of the UV-to-soft-X radiation and re-emits it at longer wavelengths, mostly in the IR. Thus, obscured active galactic nuclei (AGN) are ver…
Constraining Progenitors of Observed Low-mass X-ray Binaries Using Convection and Rotation-Boosted Magnetic Braking
Van, Kenny X.; Ivanova, Natalia
We present a new method for constraining the mass transfer evolution of low-mass X-ray binaries (LMXBs)-a reverse population synthesis technique. This is done using the detailed 1D stellar evolution code MESA (Modules for Experiments in Stellar Astrophysics) to evolve a high-resolution grid of binary systems spanning a comprehensive range of initi…