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2025A&A...695A.152A - Astronomy and Astrophysics, volume 695A152 (2025/3-1)
Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission.
ABE K., ABE S., ABHISHEK A., ACERO F., AGUASCA-CABOT A., AGUDO I., ALISPACH C., ALVAREZ CRESPO N., AMBROSINO D., ANTONELLI L.A., ARAMO C., ARBET-ENGELS A., ARCARO C., ASANO K., AUBERT P., BAKTASH A., BALBO M., BAMBA A., BAQUERO LARRIVA A., BARRES DE ALMEIDA U., BARRIO J.A., BARRIOS JIMENEZ L., BATKOVIC I., BAXTER J., BECERRA GONZALEZ J., BERNARDINI E., BERNETE J., BERTI A., BEZSHYIKO I., BHATTACHARJEE P., BIGONGIARI C., BISSALDI E., BLANCH O., BONNOLI G., BORDAS P., BORKOWSKI G., BRUNELLI G., BULGARELLI A., BUNSE M., BURELLI I., BURMISTROV L., BUSCEMI M., CARDILLO M., CAROFF S., CAROSI A., CARRASCO M.S., CASSOL F., CASTREJON N., CERASOLE D., CERIBELLA G., CHAI Y., CHENG K., CHIAVASSA A., CHIKAWA M., CHON G., CHYTKA L., CICCIARI G.M., CIFUENTES A., CONTRERAS J.L., CORTINA J., COSTANTINI H., DA VELA P., DALCHENKO M., DAZZI F., DE ANGELIS A., DE BONY DE LAVERGNE M., DE LOTTO B., DE MENEZES R., DEL BURGO R., DEL PERAL L., DELGADO C., DELGADO MENGUAL J., DELLA VOLPE D., DELLAIERA M., DI PIANO A., DI PIERRO F., DI TRIA R., DI VENERE L., DIAZ C., DOMINIK R.M., DOMINIS PRESTER D., DONINI A., DORE D., DORNER D., DORO M., EISENBERGER L., ELSASSER D., EMERY G., ESCUDERO J., FALLAH RAMAZANI V., FERRAROTTO F., FIASSON A., FOFFANO L., FREIXAS COROMINA L., FROSE S., FUKAZAWA Y., GARCIA LOPEZ R., GASBARRA C., GASPARRINI D., GEYER D., GIESBRECHT PAIVA J., GIGLIETTO N., GIORDANO F., GLIWNY P., GODINOVIC N., GRAU R., GREEN D., GREEN J., GUNJI S., GUNTHER P., HACKFELD J., HADASCH D., HAHN A., HASSAN T., HAYASHI K., HECKMANN L., HELLER M., HERRERA LLORENTE J., HIROTANI K., HOFFMANN D., HORNS D., HOULES J., HRABOVSKY M., HRUPEC D., HUI D., IARLORI M., IMAZAWA R., INADA T., INOME Y., INOUE S., IOKA K., IORI M., IULIANO A., JAHANVI J., JIMENEZ MARTINEZ I., JIMENEZ QUILES J., JURYSEK J., KAGAYA M., KALASHEV O., KARAS V., KATAGIRI H., KATAOKA J., KERSZBERG D., KOBAYASHI Y., KOHRI K., KONG A., KUBO H., KUSHIDA J., LACAVE B., LAINEZ M., LAMANNA G., LAMASTRA A., LEMOIGNE L., LINHOFF M., LONGO F., LOPEZ-COTO R., LOPEZ-MOYA M., LOPEZ-ORAMAS A., LOPORCHIO S., LORINI A., LOZANO BAHILO J., LUCIANI H., LUQUE-ESCAMILLA P.L., MAJUMDAR P., MAKARIEV M., MALLAMACI M., MANDAT D., MANGANARO M., MANICO G., MANNHEIM K., MARCHESI S., MARIOTTI M., MARQUEZ P., MARSELLA G., MARTI J., MARTINEZ O., MARTINEZ G., MARTINEZ M., MAS-AGUILAR A., MAURIN G., MAZIN D., MENDEZ-GALLEGO J., MENON S., MESTRE GUILLEN E., MICANOVIC S., MICELI D., MIENER T., MIRANDA J.M., MIRZOYAN R., MIZUNO T., MOLERO GONZALEZ M., MOLINA E., MONTARULI T., MORALEJO A., MORCUENDE D., MORSELLI A., MOYA V., MURAISHI H., NAGATAKI S., NAKAMORI T., NERONOV A., NICKEL L., NIETO CASTANO D., NIEVAS ROSILLO M., NIKOLIC L., NISHIJIMA K., NODA K., NOSEK D., NOVOTNY V., NOZAKI S., OHISHI M., OHTANI Y., OKA T., OKUMURA A., ORITO R., OTERO-SANTOS J., OTTANELLI P., OWEN E., PALATIELLO M., PANEQUE D., PANTALEO F.R., PAOLETTI R., PAREDES J.M., PECH M., PECIMOTIKA M., PERESANO M., PFEIFLE F., PIETROPAOLO E., PIHET M., PIROLA G., PLARD C., PODOBNIK F., PONS E., PRANDINI E., PROUZA M., RAINO S., RANDO R., RHODE W., RIBO M., RIGHI C., RIZI V., RODRIGUEZ FERNANDEZ G., RODRIGUEZ FRIAS M.D., ROMANO P., RUINA A., RUIZ-VELASCO E., SAITO T., SAKURAI S., SANCHEZ D.A., SANO H., SARIC T., SATO Y., SATURNI F.G., SAVCHENKO V., SCHIAVONE F., SCHLEICHER B., SCHMUCKERMAIER F., SCHUBERT J.L., SCHUSSLER F., SCHWEIZER T., SEGLAR ARROYO M., SIEGERT T., SIMONGINI A., SITAREK J., SLIUSAR V., STAMERRA A., STRISKOVIC J., STRZYS M., SUDA Y., SUNNY A., TAJIMA H., TAKAHASHI H., TAKAHASHI M., TAKATA J., TAKEISHI R., TAM P.H.T., TANAKA S.J., TATEISHI D., TAVERNIER T., TEMNIKOV P., TERADA Y., TERAUCHI K., TERZIC T., TESHIMA M., TLUCZYKONT M., TOENNIS C., TOKANAI F., TORRES D.F., TRAVNICEK P., TUTONE A., VACULA M., VAN SCHERPENBERG J., VAZQUEZ ACOSTA M., VENTURA S., VERCELLONE S., VERNA G., VIALE I., VIGLIANO A., VIGORITO C.F., VISENTIN E., VITALE V., VOITSEKHOVSKYI V., VOUTSINAS G., VOVK I., VUILLAUME T., WALTER R., WAN L., WILL M., WOJTOWICZ J., YAMAMOTO T., YAMAZAKI R., YAO Y., YEUNG P.K.H., YOSHIDA T., YOSHIKOSHI T., ZHANG W. and ZYWUCKA N.
Abstract (from CDS):
Aims. We report the analysis of the RS Oph observations with LST-1. We constrain the particle population that causes the observed emission in hadronic and leptonic scenarios. Additionally, we study the prospects of detecting further novae using LST-1 and the upcoming LST array of CTAO-North.
Methods. We conducted target-of-opportunity observations with LST-1 from the first day of this nova event. The data were analysed in the framework of cta-lstchain and Gammapy, the official CTAO-LST reconstruction and analysis packages. One-zone hadronic and leptonic models were considered to model the gamma-ray emission of RS Oph using the spectral information from Fermi-LAT and LST-1, together with public data from the MAGIC and H.E.S.S. telescopes.
Results. RS Oph was detected at 6.6σ with LST-1 in the first 6.35 hours of observations following the eruption. The hadronic scenario is preferred over the leptonic scenario considering a proton energy spectrum with a power-law model with an exponential cutoff whose position increases from (0.26 ± 0.08) TeV on day 1 up to (1.6 ± 0.6) TeV on day 4 after the eruption. The deep sensitivity and low energy threshold of the LST-1/LST array will allow us to detect faint novae and increase their discovery rate.
Abstract Copyright: © The Authors 2025
Journal keyword(s): radiation mechanisms: non-thermal - binaries: close - binaries: symbiotic - novae - cataclysmic variables - stars: individual: RS Ophiuchi - gamma rays: stars
Simbad objects: 11
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