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Return-Path: <atel@astronomerstelegram.org> Delivered-To: stefano@bicar.it Received: by mail.planetcloud-host.com (Postfix, from userid 1016) id C452A14ECA; Thu, 10 Jul 2025 09:05:43 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.planetcloud-host.com X-Spam-Level: X-Spam-Status: No, score=-0.0 required=7.0 tests=RCVD_IN_DNSWL_BLOCKED, RCVD_IN_VALIDITY_RPBL_BLOCKED,RCVD_IN_VALIDITY_SAFE_BLOCKED,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=disabled version=3.4.0 Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=174.142.199.243; helo=server.astronomerstelegram.org; envelope-from=atel@astronomerstelegram.org; receiver=stefano@bicar.it Received: from server.astronomerstelegram.org (astronomerstelegram.org [174.142.199.243]) by mail.planetcloud-host.com (Postfix) with ESMTP id 07F0914B3C for <stefano@bicar.it>; Thu, 10 Jul 2025 09:05:41 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 9C24328802EA for <stefano@bicar.it>; Thu, 10 Jul 2025 03:05:40 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17281 Message-Id: <20250710070540.9C24328802EA@server.astronomerstelegram.org> Date: Thu, 10 Jul 2025 03:05:40 -0400 (EDT) ------------------------------------------------------------------------------ The Astronomer's Telegram is free to read, free to publish, free to use. Thanks to the support of our patrons, we can continue to keep it free. https://www.patreon.com/astronomerstel ------------------------------------------------------------------------------ The Astronomer's Telegram http://www.astronomerstelegram.org ------------------------------------------------------------------------------ Posted: Within the last 24 hours ============================================================================== ATEL #17281 ATEL #17281 Title: NuSTAR upper limit on X-ray emission of nova V462 Lupi Author: Kirill Sokolovsky (UIUC), Elias Aydi (TTU), Laura Chomiuk, Peter Craig, Isabella Molina (MSU), Jennifer Sokoloski (Columbia), Justin Linford (NRAO), Koji Mukai (NASA/GSFC) Queries: kirx@kirx.net Posted: 9 Jul 2025; 19:30 UT Subjects:X-ray, Nova Nova Lupi 2025, also known as V462 Lup (CBET #5570), AT 2025nlr and ASASSN-25cm, was discovered by the ASAS-SN survey (Shappee et al. 2014, ApJ, 788, 48; Kochanek et al.2017, PASP, 129, 104502) on 2025-06-12.870 UTC and reported via the Transient Name Server (Stanek et al. 2025, TNS Astronomical Transient Report No. 258408). It was spectroscopically confirmed as a classical nova (ATel #17228). Pre-discovery detections and improved astrometry with GOTO-South telescope were reported in ATel #17237. An orbital period of 1.797 hours was suggested on the basis of pre-eruption TESS photometry (ATel #17240). The nova was detected at E>100 MeV by Fermi-LAT (ATel #17249) and upper limits on its neutrino flux were derived with IceCube (ATel #17266). V462 Lupi was observed with NuSTAR from 2025-06-30.038 to 2025-07-01.017 for a total exposure of 45 ks. No X-ray source is found at the nova position with a combined two-module count rate upper limit of 0.0013 cts/s. Assuming kT= 4 keV thermal plasma emission (as observed in V1674 Her; Sokolovsky et al. 2023, MNRAS, 521, 5453) and the total line of sight HI column density of 7.1x10^20 cm^-2 (Kalberla et al. 2005 A&A, 440, 775; https://www.astro.uni-bonn.de/hisurvey/AllSky_profiles/index.php ) this corresponds to a galactic-absorption-corrected 3.0-78 keV flux limit of 5x10^-14 ergs/cm^2/s. Extrapolated down to the Swift/XRT 0.3-10.0 keV band, the NuSTAR upper limit translates to 1x10^-13 ergs/cm^2/s, or XRT PC mode count rate of 0.002 cts/s. Given the Fermi-LAT detection, we speculate that a shock is present within the ejecta of V462 Lup, but its thermal emission is invisible to NuSTAR due to extreme absorption intrinsic to the ejecta. ------------------------------------------------------------------------------ Password Certification: Kirill Sokolovsky (kirx@scan.sai.msu.ru) https://www.astronomerstelegram.org/?read=17281 ============================================================================== ============================================================================== This is an automatically-generated notice. You can remove yourself permanently from receiving both the Daily Email Digest and Instant Email Notices from The Astronomer's Telegram by following this link: https://www.astronomerstelegram.org?unsubscribe&confirmation=a803d34e7ea924f9a4142bac00763549&address=stefano@bicar.it
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