Astrophysics – Page 455 – Kavli Institute Pre-Print Publications

The R-Process Alliance: A Nearly Complete R-Process Abundance Template Derived from Ultraviolet Spectroscopy of the R-Process-Enhanced Metal-Poor Star HD 222925

Posted by klaurent May 6, 2022MIT

Kavli Affiliate: Anna Frebel | First 5 Authors: Ian U. Roederer, James E. Lawler, Elizabeth A. Den Hartog, Vinicius M. Placco, Rebecca Surman | Summary: We present a nearly complete rapid neutron-capture process (r-process) chemical inventory of the metal-poor ([Fe/H] = -1.46 +/- 0.10) r-process-enhanced ([Eu/Fe] = +1.32 +/- 0.08) halo star HD 222925. This […]

Continue..

Gravothermal solutions of SIDM halos: mapping from constant to velocity-dependent cross section

Posted by klaurent May 5, 2022Peking

Shengqi Yang, Xiaolong Du, Zhichao Carton Zeng, Andrew Benson, Fangzhou Jiang | Summary: [[{“value”:”The scale-free gravothermal fluid formalism has long proved effective in describing the evolution of self-interacting dark matter halos with a constant dark matter particle cross section. However, whether the gravothermal fluid solutions match numerical simulations for velocity-dependent cross-section scenarios remains untested. In […]

Continue..

Kepler K2 and TESS observations of two magnetic cataclysmic variables: The new asynchronous polar SDSS J084617.11+245344.1 and Paloma

Posted by klaurent May 5, 2022May 17, 2022MIT

Kavli Affiliate: Saul A. Rappaport | First 5 Authors: Colin Littlefield, D. W. Hoard, Peter Garnavich, Paula Szkody, Paul A. Mason | Summary: There have been relatively few published long-duration, uninterrupted light curves of magnetic cataclysmic variable stars in which the accreting white dwarf’s rotational frequency is slightly desynchronized from the binary orbital frequency (asynchronous […]

Continue..

Proximity-Induced Superconductivity in Epitaxial Topological Insulator/Graphene/Gallium Heterostructures

Posted by klaurent May 5, 2022Peking

Kavli Affiliate: Ke Wang | First 5 Authors: Cequn Li, Yi-Fan Zhao, Alexander Vera, Omri Lesser, Hemian Yi | Summary: The introduction of superconductivity to the Dirac surface states of a topological insulator leads to a novel state of matter known as a topological superconductor. A topological superconductor may host Majorana zero modes, the braiding […]

Continue..

The Discovery of a Planetary Companion Interior to Hot Jupiter WASP-132 b

Posted by klaurent May 5, 2022May 17, 2022MIT

Kavli Affiliate: Andrew Vanderburg, Sara Seager | First 5 Authors: Benjamin J. Hord, Knicole D. Colón, Travis A. Berger, Veselin Kostov, Michele L. Silverstein | Summary: Hot Jupiters are generally observed to lack close planetary companions, a trend that has been interpreted as evidence for high-eccentricity migration. We present the discovery and validation of WASP-132 […]

Continue..

The Discovery of a Planetary Companion Interior to Hot Jupiter WASP-132 b

Posted by klaurent May 5, 2022MIT

Kavli Affiliate: Sara Seager | First 5 Authors: Benjamin J. Hord, Knicole D. Colón, Travis A. Berger, Veselin Kostov, Michele L. Silverstein | Summary: Hot Jupiters are generally observed to lack close planetary companions, a trend that has been interpreted as evidence for high-eccentricity migration. We present the discovery and validation of WASP-132 c (TOI-822.02), […]

Continue..

Soft and Hard Constrained Parametric Generative Schemes for Encoding and Synthesizing Airfoils

Posted by klaurent May 5, 2022Peking

Kavli Affiliate: Jing Wang | First 5 Authors: Hairun Xie, Jing Wang, Miao Zhang, , | Summary: Traditional airfoil parametric technique has significant limitation in modern aerodynamic optimization design.There is a strong demand for developing a parametric method with good intuitiveness, flexibility and representative accuracy. In this paper, two parametric generative schemes based on deep […]

Continue..

A 62-minute orbital period black widow binary in a wide hierarchical triple

Posted by klaurent May 4, 2022MIT

Kavli Affiliate: Erin Kara | First 5 Authors: Kevin B. Burdge, Thomas R. Marsh, Jim Fuller, Eric C. Bellm, Ilaria Caiazzo | Summary: Over a dozen millisecond pulsars are ablating low-mass companions in close binary systems. In the original "black widow", the 8-hour orbital period eclipsing pulsar PSR J1959+2048 (PSR B1957+20), high energy emission originating […]

Continue..

The THESAN project: ionizing escape fractions of reionization-era galaxies

Posted by klaurent May 4, 2022May 17, 2022MIT

Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Jessica Y. -C. Yeh, Aaron Smith, Rahul Kannan, Enrico Garaldi, Mark Vogelsberger | Summary: A fundamental requirement for reionizing the Universe is that a sufficient fraction of the ionizing photons emitted by galaxies successfully escapes into the intergalactic medium. However, due to the scarcity of high-redshift observational […]

Continue..

Electromagnetic Follow-ups of Binary Neutron Star Mergers with Early Warnings from Decihertz Gravitational-wave Observatories

Posted by klaurent May 4, 2022Peking

Kavli Affiliate: Lijing Shao | First 5 Authors: Yacheng Kang, Chang Liu, Lijing Shao, , | Summary: We investigate the prospects of electromagnetic follow-ups for binary neutron star (BNS) mergers, with the help of early warnings from decihertz gravitational-wave (GW) observatories, B-DECIGO and DO-Optimal. Extending our previous work in Liu et al. (2022), we not […]

Continue..