Tootfinder

Magnetic fields beneath active region coronal loops
Philip Judge, Lucia Kleint, Christoph Kuckein
https://arxiv.org/abs/2405.05391 https://

Magnetic fields beneath active region coronal loops
We examine the hypothesis that multipolar magnetic fields advected by photospheric granules can contribute heating to the active chromosphere and corona. On 28 September 2020 the GRIS and HiFI+ instruments at the GREGOR telescope obtained data of NOAA 12773. We analyze Stokes profiles of spectral lines of Si I and He I, to study magnetic fields from photosphere to the upper chromosphere. Magnetogram and EUV data from the HMI and AIA instruments on the SDO spacecraft are co-aligned and studied i…

Microlensing optical depth and event rate toward the Large Magellanic Cloud based on 20 years of OGLE observations
P. Mroz, A. Udalski, M. K. Szymanski, M. Kapusta, I. Soszynski, L. Wyrzykowski, P. Pietrukowicz, S. Kozlowski, R. Poleski, J. Skowron, D. Skowron, K. Ulaczyk, M. Gromadzki, K. Rybicki, P. Iwanek, M. Wrona, M. Ratajczak
https://arxiv.org/abs/2403.02398 https://arxiv.org/pdf/2403.02398
arXiv:2403.02398v1 Announce Type: new
Abstract: Measurements of the microlensing optical depth and event rate toward the Large Magellanic Cloud (LMC) can be used to probe the distribution and mass function of compact objects in the direction toward that galaxy - in the Milky Way disk, Milky Way dark matter halo, and the LMC itself. The previous measurements, based on small statistical samples of events, found that the optical depth is an order of magnitude smaller than that expected from the entire dark matter halo in the form of compact objects. However, these previous studies were not sensitive to long-duration events with Einstein timescales longer than 2.5-3 years, which are expected from massive ($10-100\,M_{\odot}$) and intermediate-mass ($10^2-10^5\,M_{\odot}$) black holes. Such events would have been missed by the previous studies and would not have been taken into account in calculations of the optical depth. Here, we present the analysis of nearly 20-year-long photometric monitoring of 78.7 million stars in the LMC by the Optical Gravitational Lensing Experiment (OGLE) from 2001 through 2020. We describe the observing setup, the construction of the 20-year OGLE dataset, the methods used for searching for microlensing events in the light curve data, and the calculation of the event detection efficiency. In total, we find 16 microlensing events (thirteen using an automated pipeline and three with manual searches), all of which have timescales shorter than 1 yr. We use a sample of thirteen events to measure the microlensing optical depth toward the LMC $\tau=(0.121 \pm 0.037)\times 10^{-7}$ and the event rate $\Gamma=(0.74 \pm 0.25)\times 10^{-7}\,\mathrm{yr}^{-1}\,\mathrm{star}^{-1}$. These numbers are consistent with lensing by stars in the Milky Way disk and the LMC itself, and demonstrate that massive and intermediate-mass black holes cannot comprise a significant fraction of dark matter.

Towards Image Synthesis with Photon Counting Stellar Intensity Interferometry
Alessia Spolon, Michele Fiori, Luca Zampieri, Marco Landoni
https://arxiv.org/abs/2404.18507

Towards Image Synthesis with Photon Counting Stellar Intensity Interferometry
Stellar intensity interferometry (SII) is based on the correlation of the light intensity fluctuations of a star detected at two or more telescopes, with no need to combine the collected photons directly. A measurement of the correlation in full "photon-counting mode" was experimented with fast photon counters in Italy (2016-2020) and is currently being adapted to the ASTRI Mini-Array. Performing image synthesis with "photon-counting" SII requires a series of preparatory activities that involve…

The DESI Early Data Release White Dwarf Catalogue
Christopher J. Manser, Paula Izquierdo, Boris T. G\"ansicke, Andrew Swan, Detlev Koester, Akshay Robert, Siyi Xu, Keith Inight, Ben Amroota, N. P. Gentile Fusillo, Sergey E. Koposov, Bokyoung Kim, Arjun Dey, Carlos Allende Prieto, J. Aguilar, S. Ahlen, R. Blum, D. Brooks, T. Claybaugh, A. P. Cooper, K. Dawson, A. de la Macorra, P. Doel, J. E. Forero-Romero, E. Gazta\~naga, S. Gontcho A Gontcho, K. Honscheid, T. Kisner, A. Kremin, A…

The DESI Early Data Release White Dwarf Catalogue
The Early Data Release (EDR) of the Dark Energy Spectroscopic Instrument (DESI) comprises spectroscopy obtained from 2020 December 14 to 2021 June 10. White dwarfs were targeted by DESI both as calibration sources and as science targets and were selected based on Gaia photometry and astrometry. Here we present the DESI EDR white dwarf catalogue, which includes 2706 spectroscopically confirmed white dwarfs of which approximately 1630 (roughly 60 per cent) have been spectroscopically observed for…

The DESI Early Data Release White Dwarf Catalogue
Christopher J. Manser, Paula Izquierdo, Boris T. G\"ansicke, Andrew Swan, Detlev Koester, Akshay Robert, Siyi Xu, Keith Inight, Ben Amroota, N. P. Gentile Fusillo, Sergey E. Koposov, Bokyoung Kim, Arjun Dey, Carlos Allende Prieto, J. Aguilar, S. Ahlen, R. Blum, D. Brooks, T. Claybaugh, A. P. Cooper, K. Dawson, A. de la Macorra, P. Doel, J. E. Forero-Romero, E. Gazta\~naga, S. Gontcho A Gontcho, K. Honscheid, T. Kisner, A. Kremin, A…

The DESI Early Data Release White Dwarf Catalogue
The Early Data Release (EDR) of the Dark Energy Spectroscopic Instrument (DESI) comprises spectroscopy obtained from 2020 December 14 to 2021 June 10. White dwarfs were targeted by DESI both as calibration sources and as science targets and were selected based on Gaia photometry and astrometry. Here we present the DESI EDR white dwarf catalogue, which includes 2706 spectroscopically confirmed white dwarfs of which approximately 1630 (roughly 60 per cent) have been spectroscopically observed for…

This https://arxiv.org/abs/2302.06724 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

DIAmante TESS AutoRegressive Planet Search (DTARPS): II. Hundreds of New TESS Candidate Exoplanets
The DIAmante TESS AutoRegressive Planet Search (DTARPS) project seeks to identify photometric transiting planets from 976,814 southern hemisphere stars observed in Year 1 of the TESS mission. This paper follows the methodology developed by Melton et al. (Paper I) using light curves extracted and pre-processed by the DIAmante project (Montalto et al. 2020). Paper I emerged with a list of 7,377 light curves with statistical properties characteristic of transiting planets but dominated by False Al…

ROME/REA: Three-year, Tri-color Timeseries Photometry of the Galactic Bulge
R. A. Street, E. Bachelet, Y. Tsapras, M. P. G. Hundertmark, V. Bozza, D. M. Bramich, A. Cassan, M. Dominik, R. Figuera Jaimes, K. Horne, S. Mao, A. Saha, J. Wambsganss, Weicheng Zang
https://arxiv.org/abs/2403.05987…

ROME/REA: Three-year, Tri-color Timeseries Photometry of the Galactic Bulge
The ROME/REA (Robotic Observations of Microlensing Events/Reactive Event Assessment) Survey was a Key Project at Las Cumbres Observatory (hereafter LCO) which continuously monitored 20 selected fields (3.76 sq.deg.) in the Galactic Bulge throughout their seasonal visibility window over a three-year period, between March 2017 and March 2020. Observations were made in three optical passbands (SDSS-g', -r', -i'), and LCO's multi-site telescope network enabled the survey to achieve a typical cadenc…