Astrophysics – Page 409 – Kavli Institute Pre-Print Publications

BICEP / Keck XVII: Line of Sight Distortion Analysis: Estimates of Gravitational Lensing, Anisotropic Cosmic Birefringence, Patchy Reionization, and Systematic Errors

Posted by October 14, 2022Stanford

Kavli Affiliate: Chao-Lin Kuo | First 5 Authors: BICEP/Keck Collaboration, :, P. A. R. Ade, Z. Ahmed, M. Amiri | Summary: We present estimates of line-of-sight distortion fields derived from the 95 GHz and 150 GHz data taken by BICEP2, BICEP3, and Keck Array up to the 2018 observing season, leading to cosmological constraints and […]

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High-energy neutrino emission from magnetised jets of rapidly rotating protomagnetars

Posted by klaurent October 14, 2022Tokyo

Kavli Affiliate: Shunsaku Horiuchi | First 5 Authors: Mukul Bhattacharya, Jose Alonso Carpio, Kohta Murase, Shunsaku Horiuchi, | Summary: Relativistic jets originating from protomagnetar central engines can lead to long duration gamma-ray bursts (GRBs) and are considered potential sources of ultrahigh-energy cosmic rays and secondary neutrinos. We explore the propagation of such jets through a […]

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A dense mini-Neptune orbiting the bright young star HD 18599

Posted by klaurent October 14, 2022MIT

Kavli Affiliate: Avi Shporer | First 5 Authors: Jose I. Vines, James S. Jenkins, Zaira Berdiñas, Maritza G. Soto, Matías R. Díaz | Summary: Very little is known about the young planet population because the detection of small planets orbiting young stars is obscured by the effects of stellar activity and fast rotation which mask […]

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The XRISM Pipeline Software System: Connecting Continents, Processes, Testing, and Scientists

Posted by klaurent October 14, 2022MIT

Kavli Affiliate: Eric D. Miller | First 5 Authors: Trisha F. Doyle, Matthew P. Holland, Robert S. Hill, Tahir Yaqoob, Mike Loewenstein | Summary: XRISM (X-Ray Imaging and Spectroscopy Mission), with the Resolve high-resolution spectrometer and the Xtend wide-field imager on-board, is designed to build on the successes of the abbreviated Hitomi mission to address […]

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Using Host Galaxy Photometric Redshifts to Improve Cosmological Constraints with Type Ia Supernova in the LSST Era

Posted by klaurent October 14, 2022October 24, 2022Chicago

Kavli Affiliate: Richard Kessler | First 5 Authors: Ayan Mitra, Richard Kessler, Surhud More, Renee Hlozek, | Summary: We perform a rigorous cosmology analysis on simulated type Ia supernovae (SN~Ia) and evaluate the improvement from including photometric host-galaxy redshifts compared to using only the "zspec" subset with spectroscopic redshifts from the host or SN. We […]

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Using Host Galaxy Photometric Redshifts to Improve Cosmological Constraints with Type Ia Supernova in the LSST Era

Posted by October 14, 2022Chicago

Kavli Affiliate: Richard Kessler | First 5 Authors: Ayan Mitra, Richard Kessler, Surhud More, Renee Hlozek, The LSST Dark Energy Science Collaboration | Summary: We perform a rigorous cosmology analysis on simulated type Ia supernovae (SN~Ia) and evaluate the improvement from including photometric host-galaxy redshifts compared to using only the "zspec" subset with spectroscopic redshifts […]

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Spatiotemporal Classification with limited labels using Constrained Clustering for large datasets

Posted by klaurent October 14, 2022Peking

Kavli Affiliate: Ke Wang | First 5 Authors: Praveen Ravirathinam, Rahul Ghosh, Ke Wang, Keyang Xuan, Ankush Khandelwal | Summary: Creating separable representations via representation learning and clustering is critical in analyzing large unstructured datasets with only a few labels. Separable representations can lead to supervised models with better classification capabilities and additionally aid in […]

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Probable low-frequency quasi-periodic oscillations in blazars from the ZTF survey

Posted by dbos October 13, 2022Peking

Kavli Affiliate: Luis C. Ho | First 5 Authors: Anuvab Banerjee, Vibhore Negi, Ravi Joshi, Nagendra Kumar, Paul J. Wiita | Summary: We investigate the possible presence of quasi-periodic oscillation (QPO) signals in 2103 blazars from the Zwicky Transient Facility (ZTF) time-domain survey. We detect a low-frequency QPO signal in five blazars observed over these […]

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A Transient `Changing-Look’ AGN Resolved on Month Timescales From First-Year SDSS-V Data

Posted by klaurent October 13, 2022Peking

Kavli Affiliate: Claudio Ricci | First 5 Authors: Grisha Zeltyn, Benny Trakhtenbrot, Michael Eracleous, Jessie Runnoe, Jonathan R. Trump | Summary: We report the discovery of a new `changing-look’ active galactic nucleus (CLAGN) event, in the quasar SDSS J162829.17+432948.5 at z=0.2603, identified through repeat spectroscopy from the fifth Sloan Digital Sky Survey (SDSS-V). Optical photometry […]

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Toroidal flux loss due to flux emergence explains why solar cycles rise differently but decay in a similar way

Posted by klaurent October 13, 2022October 24, 2022Stanford

Kavli Affiliate: Robert Cameron | First 5 Authors: Akash Biswas, Bidya Binay Karak, Robert Cameron, , | Summary: A striking feature of the solar cycle is that at the beginning, sunspots appear around mid-latitudes, and over time the latitudes of emergences migrate towards the equator.The maximum level of activity (e.g., sunspot number) varies from cycle […]

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