Radio Detection of an Elusive Millisecond Pulsar in the Globular Cluster NGC 6397

Lei Zhang; Alessandro Ridolfi; Harsha Blumer; Paulo C.C. Freire; Richard N. Manchester; Maura McLaughlin; Kyle Kremer; Andrew D. Cameron; Zhiyu Zhang; Jan Behrend; Marta Burgay; Sarah Buchner; David J. Champion; Weiwei Chen; Shi Dai; Yi Feng; Xiaoting Fu; Meng Guo; George Hobbs; Evan F. Keane; Michael Kramer; Lina Levin; Xiangdong Li; Mengmeng Ni; Jingshan Pan; Prajwal V. Padmanabh; Andrea Possenti; Scott M. Ransom; Chao Wei Tsai; Vivek Venkatraman Krishnan; Pei Wang; Jie Zhang; Qijun Zhi; Yongkun Zhang; Di Li

doi:10.3847/2041-8213/ac81c3

Radio Detection of an Elusive Millisecond Pulsar in the Globular Cluster NGC 6397

Lei Zhang, Alessandro Ridolfi, Harsha Blumer, Paulo C.C. Freire, Richard N. Manchester, Maura McLaughlin, Kyle Kremer, Andrew D. Cameron, Zhiyu Zhang, Jan Behrend, Marta Burgay, Sarah Buchner, David J. Champion, Weiwei Chen, Shi Dai, Yi Feng, Xiaoting Fu, Meng Guo, George Hobbs, Evan F. KeaneMichael Kramer, Lina Levin, Xiangdong Li, Mengmeng Ni, Jingshan Pan, Prajwal V. Padmanabh, Andrea Possenti, Scott M. Ransom, Chao Wei Tsai, Vivek Venkatraman Krishnan, Pei Wang, Jie Zhang, Qijun Zhi, Yongkun Zhang, Di Li

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Abstract

We report the discovery of a new 5.78 ms period millisecond pulsar (MSP), PSR J1740−5340B (NGC 6397B), in an eclipsing binary system discovered with the Parkes radio telescope (now also known as Murriyang) in Australia and confirmed with the MeerKAT radio telescope in South Africa. The measured orbital period, 1.97 days, is the longest among all eclipsing binaries in globular clusters (GCs) and consistent with that of the coincident X-ray source U18, previously suggested to be a “hidden MSP.” Our XMM-Newton observations during NGC 6397B’s radio-quiescent epochs detected no X-ray flares. NGC 6397B is either a transitional MSP or an eclipsing binary in its initial stage of mass transfer after the companion star left the main sequence. The discovery of NGC 6397B potentially reveals a subgroup of extremely faint and heavily obscured binary pulsars, thus providing a plausible explanation for the apparent dearth of binary neutron stars in core-collapsed GCs as well as a critical constraint on the evolution of GCs.

Original language	English
Article number	L21
Journal	Astrophysical Journal Letters
Volume	934
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/ac81c3
Publication status	Published - 1 Aug 2022
Externally published	Yes

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Zhang, L., Ridolfi, A., Blumer, H., Freire, P. C. C., Manchester, R. N., McLaughlin, M., Kremer, K., Cameron, A. D., Zhang, Z., Behrend, J., Burgay, M., Buchner, S., Champion, D. J., Chen, W., Dai, S., Feng, Y., Fu, X., Guo, M., Hobbs, G., ... Li, D. (2022). Radio Detection of an Elusive Millisecond Pulsar in the Globular Cluster NGC 6397. Astrophysical Journal Letters, 934(2), Article L21. https://doi.org/10.3847/2041-8213/ac81c3

@article{22ec6b4b07414bdaa20c84a4344c0dbe,

title = "Radio Detection of an Elusive Millisecond Pulsar in the Globular Cluster NGC 6397",

abstract = "We report the discovery of a new 5.78 ms period millisecond pulsar (MSP), PSR J1740−5340B (NGC 6397B), in an eclipsing binary system discovered with the Parkes radio telescope (now also known as Murriyang) in Australia and confirmed with the MeerKAT radio telescope in South Africa. The measured orbital period, 1.97 days, is the longest among all eclipsing binaries in globular clusters (GCs) and consistent with that of the coincident X-ray source U18, previously suggested to be a “hidden MSP.” Our XMM-Newton observations during NGC 6397B{\textquoteright}s radio-quiescent epochs detected no X-ray flares. NGC 6397B is either a transitional MSP or an eclipsing binary in its initial stage of mass transfer after the companion star left the main sequence. The discovery of NGC 6397B potentially reveals a subgroup of extremely faint and heavily obscured binary pulsars, thus providing a plausible explanation for the apparent dearth of binary neutron stars in core-collapsed GCs as well as a critical constraint on the evolution of GCs.",

author = "Lei Zhang and Alessandro Ridolfi and Harsha Blumer and Freire, \{Paulo C.C.\} and Manchester, \{Richard N.\} and Maura McLaughlin and Kyle Kremer and Cameron, \{Andrew D.\} and Zhiyu Zhang and Jan Behrend and Marta Burgay and Sarah Buchner and Champion, \{David J.\} and Weiwei Chen and Shi Dai and Yi Feng and Xiaoting Fu and Meng Guo and George Hobbs and Keane, \{Evan F.\} and Michael Kramer and Lina Levin and Xiangdong Li and Mengmeng Ni and Jingshan Pan and Padmanabh, \{Prajwal V.\} and Andrea Possenti and Ransom, \{Scott M.\} and Tsai, \{Chao Wei\} and \{Venkatraman Krishnan\}, Vivek and Pei Wang and Jie Zhang and Qijun Zhi and Yongkun Zhang and Di Li",

note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = aug,

day = "1",

doi = "10.3847/2041-8213/ac81c3",

language = "English",

volume = "934",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

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Zhang, L, Ridolfi, A, Blumer, H, Freire, PCC, Manchester, RN, McLaughlin, M, Kremer, K, Cameron, AD, Zhang, Z, Behrend, J, Burgay, M, Buchner, S, Champion, DJ, Chen, W, Dai, S, Feng, Y, Fu, X, Guo, M, Hobbs, G, Keane, EF, Kramer, M, Levin, L, Li, X, Ni, M, Pan, J, Padmanabh, PV, Possenti, A, Ransom, SM, Tsai, CW, Venkatraman Krishnan, V, Wang, P, Zhang, J, Zhi, Q, Zhang, Y & Li, D 2022, 'Radio Detection of an Elusive Millisecond Pulsar in the Globular Cluster NGC 6397', Astrophysical Journal Letters, vol. 934, no. 2, L21. https://doi.org/10.3847/2041-8213/ac81c3

TY - JOUR

T1 - Radio Detection of an Elusive Millisecond Pulsar in the Globular Cluster NGC 6397

AU - Zhang, Lei

AU - Ridolfi, Alessandro

AU - Blumer, Harsha

AU - Freire, Paulo C.C.

AU - Manchester, Richard N.

AU - McLaughlin, Maura

AU - Kremer, Kyle

AU - Cameron, Andrew D.

AU - Zhang, Zhiyu

AU - Behrend, Jan

AU - Burgay, Marta

AU - Buchner, Sarah

AU - Champion, David J.

AU - Chen, Weiwei

AU - Dai, Shi

AU - Feng, Yi

AU - Fu, Xiaoting

AU - Guo, Meng

AU - Hobbs, George

AU - Keane, Evan F.

AU - Kramer, Michael

AU - Levin, Lina

AU - Li, Xiangdong

AU - Ni, Mengmeng

AU - Pan, Jingshan

AU - Padmanabh, Prajwal V.

AU - Possenti, Andrea

AU - Ransom, Scott M.

AU - Tsai, Chao Wei

AU - Venkatraman Krishnan, Vivek

AU - Wang, Pei

AU - Zhang, Jie

AU - Zhi, Qijun

AU - Zhang, Yongkun

AU - Li, Di

PY - 2022/8/1

Y1 - 2022/8/1

N2 - We report the discovery of a new 5.78 ms period millisecond pulsar (MSP), PSR J1740−5340B (NGC 6397B), in an eclipsing binary system discovered with the Parkes radio telescope (now also known as Murriyang) in Australia and confirmed with the MeerKAT radio telescope in South Africa. The measured orbital period, 1.97 days, is the longest among all eclipsing binaries in globular clusters (GCs) and consistent with that of the coincident X-ray source U18, previously suggested to be a “hidden MSP.” Our XMM-Newton observations during NGC 6397B’s radio-quiescent epochs detected no X-ray flares. NGC 6397B is either a transitional MSP or an eclipsing binary in its initial stage of mass transfer after the companion star left the main sequence. The discovery of NGC 6397B potentially reveals a subgroup of extremely faint and heavily obscured binary pulsars, thus providing a plausible explanation for the apparent dearth of binary neutron stars in core-collapsed GCs as well as a critical constraint on the evolution of GCs.

AB - We report the discovery of a new 5.78 ms period millisecond pulsar (MSP), PSR J1740−5340B (NGC 6397B), in an eclipsing binary system discovered with the Parkes radio telescope (now also known as Murriyang) in Australia and confirmed with the MeerKAT radio telescope in South Africa. The measured orbital period, 1.97 days, is the longest among all eclipsing binaries in globular clusters (GCs) and consistent with that of the coincident X-ray source U18, previously suggested to be a “hidden MSP.” Our XMM-Newton observations during NGC 6397B’s radio-quiescent epochs detected no X-ray flares. NGC 6397B is either a transitional MSP or an eclipsing binary in its initial stage of mass transfer after the companion star left the main sequence. The discovery of NGC 6397B potentially reveals a subgroup of extremely faint and heavily obscured binary pulsars, thus providing a plausible explanation for the apparent dearth of binary neutron stars in core-collapsed GCs as well as a critical constraint on the evolution of GCs.

UR - https://www.scopus.com/pages/publications/85135746295

U2 - 10.3847/2041-8213/ac81c3

DO - 10.3847/2041-8213/ac81c3

M3 - Article

AN - SCOPUS:85135746295

SN - 2041-8205

VL - 934

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L21

ER -

Radio Detection of an Elusive Millisecond Pulsar in the Globular Cluster NGC 6397

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