2025A&A...695A.152A

Query : 2025A&A...695A.152A

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):

Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC), and the first Large-Sized Telescope (LST-1) of the future Cherenkov Telescope Array Observatory (CTAO) at very-high gamma-ray energies above 100 GeV. This means that novae are a new class of very-high-energy (VHE) gamma-ray emitters.
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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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* V959 Mon No* 06 39 38.5992561839 +05 53 52.870895189           ~ 175 0
2 V* V906 Car No* 10 36 15.4286177568 -59 35 53.696262804           ~ 108 1
3 V* T CrB Sy* 15 59 30.1622265912 +25 55 12.613382940   11.516 10.247 9.70   M3IIIe_sh 810 0
4 V* V1535 Sco Sy* 17 03 26.1705418392 -35 04 17.816830248           ~ 51 0
5 1RXS J174525.9-075303 BLL 17 45 27.10494973 -07 53 03.9478191       17.85   ~ 95 1
6 V* RS Oph Sy* 17 50 13.1591484960 -06 42 28.480729788   11.884 10.776 11.228   K5.5/M0IIIe 1163 0
7 V* V1324 Sco No* 17 50 53.9093841216 -32 37 21.090962028           ~ 100 0
8 V* V745 Sco Sy* 17 55 22.2260994408 -33 14 58.551839808     17.987   13.353 M2/M6IIIe 265 1
9 V* V3890 Sgr No* 18 30 43.2877623168 -24 01 08.944843980     15.944 14.798 12.611 M5III 232 0
10 V* V339 Del No* 20 23 30.6873337580 +20 46 03.765339899   17.50 16.86     ~ 225 0
11 EM* AS 453 Sy* 21 02 09.8189024184 +45 46 32.733603228   16.04 14.68 11.38   Mep 337 0

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