PNV J00444033+4113068: Early superhumps with 0.7 mag amplitude and non-red color-Reference-Cited by-同舟云学术

PNV J00444033+4113068: Early superhumps with 0.7 mag amplitude and non-red color

Published:2022-09-16 Issue:6 Volume:74 Page:1287-1294
ISSN:0004-6264
Container-title:Publications of the Astronomical Society of Japan
language:en
Short-container-title:

Author:

Tampo Yusuke¹^ORCID,Isogai Keisuke¹²³,Kojiguchi Naoto¹,Uemura Makoto⁴,Kato Taichi¹,Tordai Tamás⁵,Vanmunster Tonny⁶⁷,Itoh Hiroshi⁸,Dubovsky Pavol A⁹,Medulka Tomáš⁹,Sano Yasuo¹⁰¹¹¹²,Hambsch Franz-Josef¹³¹⁴¹⁵,Taguchi Kenta¹,Maehara Hiroyuki²¹⁶,Ito Junpei¹,Nogami Daisaku¹

Affiliation:

1. Department of Astronomy, Kyoto University , Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502 , Japan

2. Okayama Observatory, Kyoto University , 3037-5 Honjo, Kamogata-cho, Asakuchi, Okayama 719-0232 , Japan

3. Department of Multi-Disciplinary Sciences, Graduate School of Arts and Sciences, The University of Tokyo , 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902 , Japan

4. Hiroshima Astrophysical Science Center, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526 , Japan

5. Polaris Observatory, Hungarian Astronomical Association , Laborc utca 2/c, 1037 Budapest , Hungary

6. Center for Backyard Astrophycis Belgium , Walhostraat 1a, B-3401 Landen , Belgium

7. Center for Backyard Astrophycis Extremadura , e-EyE Astronomical Complex, ES-06340 Fregenal de la Sierra , Spain

8. Variable Star Observers League in Japan (VSOLJ) , 1001-105 Nishiterakata-machi, Hachioji, Tokyo 192-0153 , Japan

9. Vihorlat Observatory , Mierova 4, 06601 Humenne , Slovakia

10. Variable Star Observers League in Japan (VSOLJ) , 3-1-5 Nishi 12-jou minami, Nayoro, Hokkaido 096-0022 , Japan

11. Observation and Data Center for Cosmosciences, Faculty of Science, Hokkaido University , Kita 10, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810 , Japan

12. Nayoro Observatory , 157-1 Nisshin, Nayoro, Hokkaido 096-0066 , Japan

13. Groupe Européen d’Observations Stellaires (GEOS) , 23 Parc de Levesville, 28300 Bailleau l’Evêque , France

14. Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne (BAV) , Munsterdamm 90, 12169 Berlin , Germany

15. Vereniging Voor Sterrenkunde (VVS) , Oostmeers 122 C, 8000 Brugge , Belgium

16. Subaru Telescope Okayama Branch Office, National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 3037-5 Honjo, Kamogata-cho, Asakuchi, Okayama 719-0232 , Japan

Abstract

Abstract In the first days of WZ Sge-type dwarf nova (DN) outbursts, the 2 : 1 resonance induces a spiral arm structure in the accretion disk, which is observed as early superhumps in optical light curves. We reports on our optical observations of an eclipsing WZ Sge-type DN PNV J00444033+4113068 during its 2021 superoutburst using the 3.8 m Seimei telescope and through the Variable Star Network collaboration. The eclipse analysis showed that its orbital period was 0.055425534(1) d. Our observations confirmed early superhumps with an amplitude of 0.7 mag, the largest amplitude among known WZ Sge-type DNe. More interestingly, its early superhumps became the reddest around their secondary minimum, whereas other WZ Sge-type DNe show the reddest color around the early superhump maximum. The spectrum around the peak of the outburst showed two double-peaked emission lines of He ii 4686 Å and Hα with a peak separation of ≥700 km s−1, supporting a very high-inclination system. With the early superhump mapping, the unique profile and color of the early superhump are successfully reproduced by an accretion disk with a vertically extended double arm structure. Therefore, a large amplitude and a unique color behavior of the early superhumps in PNV J00444033+4113068 can be explained by the 2 : 1 resonance model along with other WZ Sge-type DNe.

Funder

Japan Society for the Promotion of Science

Slovak Research and Development Agency

Science and Technology Facilities Council

University of Edinburgh

Queen's University Belfast

National Science Foundation

Stockholm University

University of Maryland

University of Washington

Deutsches Elektronen-Synchrotron

Los Alamos National Laboratory