Puzzling blue dips in the black hole candidate Swift J1357.2 − 0933, from ULTRACAM, SALT, ATCA, Swift, and NuSTAR
© 2019 The Author(s). We present rapid, multiwavelength photometry of the low-mass X-ray binary Swift J1357.2-0933 during its 2017 outburst. Using several sets of quasi-simultaneous ULTRACAM/NTT (optical), NuSTAR (X-ray), XRT/Swift (X-ray), SALT (optical), and ATCA (radio) observations taken during...
| Main Authors: | , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal Article |
| Language: | English |
| Published: |
OXFORD UNIV PRESS
2019
|
| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/80169 |
| _version_ | 1848764170818813952 |
|---|---|
| author | Paice, J.A. Gandhi, P. Charles, P.A. Dhillon, V.S. Marsh, T.R. Buckley, D.A.H. Kotze, M.M. Beri, A. Altamirano, D. Middleton, M.J. Plotkin, Richard Miller-Jones, James Russell, D.M. Tomsick, J. Díaz-Merced, W. Misra, R. |
| author_facet | Paice, J.A. Gandhi, P. Charles, P.A. Dhillon, V.S. Marsh, T.R. Buckley, D.A.H. Kotze, M.M. Beri, A. Altamirano, D. Middleton, M.J. Plotkin, Richard Miller-Jones, James Russell, D.M. Tomsick, J. Díaz-Merced, W. Misra, R. |
| author_sort | Paice, J.A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2019 The Author(s). We present rapid, multiwavelength photometry of the low-mass X-ray binary Swift J1357.2-0933 during its 2017 outburst. Using several sets of quasi-simultaneous ULTRACAM/NTT (optical), NuSTAR (X-ray), XRT/Swift (X-ray), SALT (optical), and ATCA (radio) observations taken during outburst decline, we confirm the frequent optical dipping that has previously been noted both in outburst and in quiescence. We also find: (1) that the dip frequency decreases as the outburst decays, similar to what was seen in the previous outburst, (2) that the dips produce a shape similar to that in binary systems with partial disc occultations, (3) that the source becomes significantly bluer during these dips, indicating an unusual geometry compared to other LMXB dippers, and (4) that dip superposition analysis confirms the lack of an X-ray response to the optical dips. These very unusual properties appear to be unique to Swift J1357.2−0933, and are likely the result of a high binary inclination, as inferred from features such as its very low outburst X-ray luminosity. From this analysis as well as X-ray/optical timing correlations, we suggest a model with multicomponent emission/absorption features with differing colours. This could include the possible presence of a sporadically occulted jet base and a recessed disc. This source still hosts many puzzling features, with consequences for the very faint X-ray transients population. |
| first_indexed | 2025-11-14T11:15:06Z |
| format | Journal Article |
| id | curtin-20.500.11937-80169 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:15:06Z |
| publishDate | 2019 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-801692020-07-29T09:32:23Z Puzzling blue dips in the black hole candidate Swift J1357.2 − 0933, from ULTRACAM, SALT, ATCA, Swift, and NuSTAR Paice, J.A. Gandhi, P. Charles, P.A. Dhillon, V.S. Marsh, T.R. Buckley, D.A.H. Kotze, M.M. Beri, A. Altamirano, D. Middleton, M.J. Plotkin, Richard Miller-Jones, James Russell, D.M. Tomsick, J. Díaz-Merced, W. Misra, R. Science & Technology Physical Sciences Astronomy & Astrophysics accretion accretion discs X-rays: binaries X-rays: individual: Swift J1357.2-0933 AFRICAN LARGE TELESCOPE TRANSIENTS OUTBURST BINARIES © 2019 The Author(s). We present rapid, multiwavelength photometry of the low-mass X-ray binary Swift J1357.2-0933 during its 2017 outburst. Using several sets of quasi-simultaneous ULTRACAM/NTT (optical), NuSTAR (X-ray), XRT/Swift (X-ray), SALT (optical), and ATCA (radio) observations taken during outburst decline, we confirm the frequent optical dipping that has previously been noted both in outburst and in quiescence. We also find: (1) that the dip frequency decreases as the outburst decays, similar to what was seen in the previous outburst, (2) that the dips produce a shape similar to that in binary systems with partial disc occultations, (3) that the source becomes significantly bluer during these dips, indicating an unusual geometry compared to other LMXB dippers, and (4) that dip superposition analysis confirms the lack of an X-ray response to the optical dips. These very unusual properties appear to be unique to Swift J1357.2−0933, and are likely the result of a high binary inclination, as inferred from features such as its very low outburst X-ray luminosity. From this analysis as well as X-ray/optical timing correlations, we suggest a model with multicomponent emission/absorption features with differing colours. This could include the possible presence of a sporadically occulted jet base and a recessed disc. This source still hosts many puzzling features, with consequences for the very faint X-ray transients population. 2019 Journal Article http://hdl.handle.net/20.500.11937/80169 10.1093/mnras/stz1613 English http://purl.org/au-research/grants/arc/FT140101082 OXFORD UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics accretion accretion discs X-rays: binaries X-rays: individual: Swift J1357.2-0933 AFRICAN LARGE TELESCOPE TRANSIENTS OUTBURST BINARIES Paice, J.A. Gandhi, P. Charles, P.A. Dhillon, V.S. Marsh, T.R. Buckley, D.A.H. Kotze, M.M. Beri, A. Altamirano, D. Middleton, M.J. Plotkin, Richard Miller-Jones, James Russell, D.M. Tomsick, J. Díaz-Merced, W. Misra, R. Puzzling blue dips in the black hole candidate Swift J1357.2 − 0933, from ULTRACAM, SALT, ATCA, Swift, and NuSTAR |
| title | Puzzling blue dips in the black hole candidate Swift J1357.2 − 0933, from ULTRACAM, SALT, ATCA, Swift, and NuSTAR |
| title_full | Puzzling blue dips in the black hole candidate Swift J1357.2 − 0933, from ULTRACAM, SALT, ATCA, Swift, and NuSTAR |
| title_fullStr | Puzzling blue dips in the black hole candidate Swift J1357.2 − 0933, from ULTRACAM, SALT, ATCA, Swift, and NuSTAR |
| title_full_unstemmed | Puzzling blue dips in the black hole candidate Swift J1357.2 − 0933, from ULTRACAM, SALT, ATCA, Swift, and NuSTAR |
| title_short | Puzzling blue dips in the black hole candidate Swift J1357.2 − 0933, from ULTRACAM, SALT, ATCA, Swift, and NuSTAR |
| title_sort | puzzling blue dips in the black hole candidate swift j1357.2 − 0933, from ultracam, salt, atca, swift, and nustar |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics accretion accretion discs X-rays: binaries X-rays: individual: Swift J1357.2-0933 AFRICAN LARGE TELESCOPE TRANSIENTS OUTBURST BINARIES |
| url | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/80169 |