Large-scale changes of the cloud coverage in the epsilon Indi Ba and Bb system

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Large-scale changes of the cloud coverage in the epsilon Indi Ba and Bb system. / Hitchcock, J. A.; Helling, Ch.; Scholz, A.; Hodosan, G.; Dominik, M.; Hundertmark, M.; Jorgensen, U. G.; Longa-Pena, P.; Sajadian, S.; Skottfelt, J.; Snodgrass, C.; Bozza, V.; Burgdorf, M. J.; Campbell-White, J.; Figuera Jaimes, Roberto; Fujii, Y. I.; Haikala, L. K.; Henning, T.; Hinse, T. C.; Lowry, S.; Mancini, L.; Rahvar, S.; Rabus, M.; Southworth, J.; von Essen, C.; MiNDSTEp Collaboration.

In: Monthly Notices of the Royal Astronomical Society, Vol. 495, No. 4, 18.05.2020, p. 3881-3899.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Hitchcock, JA, Helling, C, Scholz, A, Hodosan, G, Dominik, M, Hundertmark, M, Jorgensen, UG, Longa-Pena, P, Sajadian, S, Skottfelt, J, Snodgrass, C, Bozza, V, Burgdorf, MJ, Campbell-White, J, Figuera Jaimes, R, Fujii, YI, Haikala, LK, Henning, T, Hinse, TC, Lowry, S, Mancini, L, Rahvar, S, Rabus, M, Southworth, J, von Essen, C & MiNDSTEp Collaboration 2020, 'Large-scale changes of the cloud coverage in the epsilon Indi Ba and Bb system', Monthly Notices of the Royal Astronomical Society, vol. 495, no. 4, pp. 3881-3899. https://doi.org/10.1093/mnras/staa1344

APA

Hitchcock, J. A., Helling, C., Scholz, A., Hodosan, G., Dominik, M., Hundertmark, M., Jorgensen, U. G., Longa-Pena, P., Sajadian, S., Skottfelt, J., Snodgrass, C., Bozza, V., Burgdorf, M. J., Campbell-White, J., Figuera Jaimes, R., Fujii, Y. I., Haikala, L. K., Henning, T., Hinse, T. C., ... MiNDSTEp Collaboration (2020). Large-scale changes of the cloud coverage in the epsilon Indi Ba and Bb system. Monthly Notices of the Royal Astronomical Society, 495(4), 3881-3899. https://doi.org/10.1093/mnras/staa1344

Vancouver

Hitchcock JA, Helling C, Scholz A, Hodosan G, Dominik M, Hundertmark M et al. Large-scale changes of the cloud coverage in the epsilon Indi Ba and Bb system. Monthly Notices of the Royal Astronomical Society. 2020 May 18;495(4):3881-3899. https://doi.org/10.1093/mnras/staa1344

Author

Hitchcock, J. A. ; Helling, Ch. ; Scholz, A. ; Hodosan, G. ; Dominik, M. ; Hundertmark, M. ; Jorgensen, U. G. ; Longa-Pena, P. ; Sajadian, S. ; Skottfelt, J. ; Snodgrass, C. ; Bozza, V. ; Burgdorf, M. J. ; Campbell-White, J. ; Figuera Jaimes, Roberto ; Fujii, Y. I. ; Haikala, L. K. ; Henning, T. ; Hinse, T. C. ; Lowry, S. ; Mancini, L. ; Rahvar, S. ; Rabus, M. ; Southworth, J. ; von Essen, C. ; MiNDSTEp Collaboration. / Large-scale changes of the cloud coverage in the epsilon Indi Ba and Bb system. In: Monthly Notices of the Royal Astronomical Society. 2020 ; Vol. 495, No. 4. pp. 3881-3899.

Bibtex

@article{fee66740cfaa4abab5e9345f3700fcd8,
title = "Large-scale changes of the cloud coverage in the epsilon Indi Ba and Bb system",
abstract = "We present the results of 14 nights of I-band photometric monitoring of the nearby brown dwarf binary, epsilon Indi Ba and Bb. Observations were acquired over 2 months, with a total of close to 42 h of coverage at a typically high cadence of 1.4 min. At a separation of just 0.7 arcsec, we do not resolve the individual components, and so effectively treat the binary as if it were a single object. However, epsilon Indi Ba (spectral type T1) is the brightest known T-type brown dwarf, and is expected to dominate the photometric signal. We typically find no strong variability associated with the target during each individual night of observing, but see significant changes in mean brightness - by as much as 0.10 mag - over the 2 months of the campaign. This strong variation is apparent on a time-scale of at least 2 d. We detect no clear periodic signature, which suggests that we may be observing the T1 brown dwarf almost pole-on, and the days-long variability in mean brightness is caused by changes in the large-scale structure of the cloud coverage. Dynamic clouds will very likely produce lightning, and complementary high-cadence V-band and H alpha images were acquired to search for the emission signatures associated with stochastic 'strikes'. We report no positive detections for the target in either of these passbands.",
keywords = "techniques: photometric, brown dwarfs, stars: individual: epsilon Indi Ba and Bb, TIME-SERIES OBSERVATIONS, DWARF, VARIABILITY, TEMPERATURE, PHOTOMETRY, SEARCH",
author = "Hitchcock, {J. A.} and Ch. Helling and A. Scholz and G. Hodosan and M. Dominik and M. Hundertmark and Jorgensen, {U. G.} and P. Longa-Pena and S. Sajadian and J. Skottfelt and C. Snodgrass and V. Bozza and Burgdorf, {M. J.} and J. Campbell-White and {Figuera Jaimes}, Roberto and Fujii, {Y. I.} and Haikala, {L. K.} and T. Henning and Hinse, {T. C.} and S. Lowry and L. Mancini and S. Rahvar and M. Rabus and J. Southworth and {von Essen}, C. and {MiNDSTEp Collaboration}",
note = "Erratum: Vol.506, Isuue 3, Pages: 3418-3418 DOI: 10.1093/mnras/stab1989",
year = "2020",
month = may,
day = "18",
doi = "10.1093/mnras/staa1344",
language = "English",
volume = "495",
pages = "3881--3899",
journal = "Royal Astronomical Society. Monthly Notices",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

RIS

TY - JOUR

T1 - Large-scale changes of the cloud coverage in the epsilon Indi Ba and Bb system

AU - Hitchcock, J. A.

AU - Helling, Ch.

AU - Scholz, A.

AU - Hodosan, G.

AU - Dominik, M.

AU - Hundertmark, M.

AU - Jorgensen, U. G.

AU - Longa-Pena, P.

AU - Sajadian, S.

AU - Skottfelt, J.

AU - Snodgrass, C.

AU - Bozza, V.

AU - Burgdorf, M. J.

AU - Campbell-White, J.

AU - Figuera Jaimes, Roberto

AU - Fujii, Y. I.

AU - Haikala, L. K.

AU - Henning, T.

AU - Hinse, T. C.

AU - Lowry, S.

AU - Mancini, L.

AU - Rahvar, S.

AU - Rabus, M.

AU - Southworth, J.

AU - von Essen, C.

AU - MiNDSTEp Collaboration

N1 - Erratum: Vol.506, Isuue 3, Pages: 3418-3418 DOI: 10.1093/mnras/stab1989

PY - 2020/5/18

Y1 - 2020/5/18

N2 - We present the results of 14 nights of I-band photometric monitoring of the nearby brown dwarf binary, epsilon Indi Ba and Bb. Observations were acquired over 2 months, with a total of close to 42 h of coverage at a typically high cadence of 1.4 min. At a separation of just 0.7 arcsec, we do not resolve the individual components, and so effectively treat the binary as if it were a single object. However, epsilon Indi Ba (spectral type T1) is the brightest known T-type brown dwarf, and is expected to dominate the photometric signal. We typically find no strong variability associated with the target during each individual night of observing, but see significant changes in mean brightness - by as much as 0.10 mag - over the 2 months of the campaign. This strong variation is apparent on a time-scale of at least 2 d. We detect no clear periodic signature, which suggests that we may be observing the T1 brown dwarf almost pole-on, and the days-long variability in mean brightness is caused by changes in the large-scale structure of the cloud coverage. Dynamic clouds will very likely produce lightning, and complementary high-cadence V-band and H alpha images were acquired to search for the emission signatures associated with stochastic 'strikes'. We report no positive detections for the target in either of these passbands.

AB - We present the results of 14 nights of I-band photometric monitoring of the nearby brown dwarf binary, epsilon Indi Ba and Bb. Observations were acquired over 2 months, with a total of close to 42 h of coverage at a typically high cadence of 1.4 min. At a separation of just 0.7 arcsec, we do not resolve the individual components, and so effectively treat the binary as if it were a single object. However, epsilon Indi Ba (spectral type T1) is the brightest known T-type brown dwarf, and is expected to dominate the photometric signal. We typically find no strong variability associated with the target during each individual night of observing, but see significant changes in mean brightness - by as much as 0.10 mag - over the 2 months of the campaign. This strong variation is apparent on a time-scale of at least 2 d. We detect no clear periodic signature, which suggests that we may be observing the T1 brown dwarf almost pole-on, and the days-long variability in mean brightness is caused by changes in the large-scale structure of the cloud coverage. Dynamic clouds will very likely produce lightning, and complementary high-cadence V-band and H alpha images were acquired to search for the emission signatures associated with stochastic 'strikes'. We report no positive detections for the target in either of these passbands.

KW - techniques: photometric

KW - brown dwarfs

KW - stars: individual: epsilon Indi Ba and Bb

KW - TIME-SERIES OBSERVATIONS

KW - DWARF

KW - VARIABILITY

KW - TEMPERATURE

KW - PHOTOMETRY

KW - SEARCH

U2 - 10.1093/mnras/staa1344

DO - 10.1093/mnras/staa1344

M3 - Journal article

VL - 495

SP - 3881

EP - 3899

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 4

ER -

ID: 246728998