Nova V462 Lup 2025: Upper limits from a neutrino search with IceCube

ATel #17266; Jessie Thwaites (University of Wisconsin-Madison), Justin Vandenbroucke (University of Wisconsin-Madison), Anna Franckowiak (Ruhr-University Bochum)
on 3 Jul 2025; 22:12 UT
Credential Certification: Justin Vandenbroucke (justin.vandenbroucke@wisc.edu)

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The IceCube Collaboration (http://icecube.wisc.edu/) reports:

IceCube has performed a search for track-like muon neutrino events arriving from the direction of the classical nova V462 Lup 2025 discovered by ASASSN-25cm (TNS) and detected by Fermi-LAT (ATel #17249). We used a time window of 2025-06-12 12:00:00 UTC to 2025-07-02 12:00:00 UTC, during which IceCube was producing good quality data.

For this search, we report a p-value of 0.04, consistent with background expectation. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 0.87 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum have energies between approximately 95 TeV and 20 PeV.

The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.

[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)