%0 Generic %1 courbin2017cosmograil %A Courbin, F. %A Bonvin, V. %A Buckley-Geer, E. %A Fassnacht, C. D. %A Frieman, J. %A Lin, H. %A Marshall, P. J. %A Suyu, S. H. %A Treu, T. %A Anguita, T. %A Motta, V. %A Meylan, G. %A Paic, E. %A Tewes, M. %A Agnello, A. %A Chao, D. C. Y. %A Chijani, M. %A Gilman, D. %A Rojas, K. %A Williams, P. %A Hempel, A. %A Kim, S. %A Lachaume, R. %A Rabus, M. %A Abbott, T. M. C. %A Allam, S. %A Annis, J. %A Banerji, M. %A Bechtol, K. %A Benoit-Lévy, A. %A Brooks, D. %A Burke, D. L. %A Rosell, A. Carnero %A Kind, M. Carrasco %A Carretero, J. %A D'Andrea, C. B. %A da Costa, L. N. %A Davis, C. %A DePoy, D. L. %A Desai, S. %A Flaugher, B. %A Fosalba, P. %A Garcia-Bellido, J. %A Gaztanaga, E. %A Goldstein, D. A. %A Gruen, D. %A Gruendl, R. A. %A Gschwend, J. %A Gutierrez, G. %A Honscheid, K. %A James, D. J. %A Kuehn, K. %A Kuhlmann, S. %A Kuropatkin, N. %A Lahav, O. %A Lima, M. %A Maia, M. A. G. %A March, M. %A Marshall, J. L. %A McMahon, R. G. %A Menanteau, F. %A Miquel, R. %A Nord, B. %A Plazas, A. A. %A Sanchez, E. %A Scarpine, V. %A Schindler, R. %A Schubnell, M. %A Sevilla-Noarbe, I. %A Smith, M. %A Soares-Santos, M. %A Sobreira, F. %A Suchyta, E. %A Tarle, G. %A Tucker, D. L. %A Walker, A. R. %A Wester, W. %D 2017 %K delay imaging quasar time %T COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408-5354 with high-cadence photometric monitoring %U http://arxiv.org/abs/1706.09424 %X We present time-delay measurements for the new quadruply imaged quasar DES J0408-5354, the first quadruply imaged quasar found in the Dark Energy Survey (DES). Our result is made possible by implementing a new observational strategy using almost daily observations with the MPIA 2.2m telescope at La Silla observatory and deep exposures reaching a signal-to-noise ratio of about 1000 per quasar image. This data quality allows us to catch small photometric variations (a few mmag rms) of the quasar, acting on temporal scales much shorter than microlensing, hence making the time delay measurement very robust against microlensing. In only 7 months we measure very accurately one of the time delays in DES J0408-5354: Dt(AB) = -112.1 +- 2.1 days (1.8%) using only the MPIA 2.2m data. In combination with data taken with the 1.2m Euler Swiss telescope, we also measure two delays involving the D component of the system Dt(AD) = -155.5 +- 12.8 days (8.2%) and Dt(BD) = -42.4 +- 17.6 days (41%), where all the error bars include systematics. Turning these time delays into cosmological constraints will require deep HST imaging or ground-based Adaptive Optics (AO), and information on the velocity field of the lensing galaxy.

@misc{courbin2017cosmograil, abstract = {We present time-delay measurements for the new quadruply imaged quasar DES J0408-5354, the first quadruply imaged quasar found in the Dark Energy Survey (DES). Our result is made possible by implementing a new observational strategy using almost daily observations with the MPIA 2.2m telescope at La Silla observatory and deep exposures reaching a signal-to-noise ratio of about 1000 per quasar image. This data quality allows us to catch small photometric variations (a few mmag rms) of the quasar, acting on temporal scales much shorter than microlensing, hence making the time delay measurement very robust against microlensing. In only 7 months we measure very accurately one of the time delays in DES J0408-5354: Dt(AB) = -112.1 +- 2.1 days (1.8%) using only the MPIA 2.2m data. In combination with data taken with the 1.2m Euler Swiss telescope, we also measure two delays involving the D component of the system Dt(AD) = -155.5 +- 12.8 days (8.2%) and Dt(BD) = -42.4 +- 17.6 days (41%), where all the error bars include systematics. Turning these time delays into cosmological constraints will require deep HST imaging or ground-based Adaptive Optics (AO), and information on the velocity field of the lensing galaxy.}, added-at = {2017-06-30T09:55:13.000+0200}, author = {Courbin, F. and Bonvin, V. and Buckley-Geer, E. and Fassnacht, C. D. and Frieman, J. and Lin, H. and Marshall, P. J. and Suyu, S. H. and Treu, T. and Anguita, T. and Motta, V. and Meylan, G. and Paic, E. and Tewes, M. and Agnello, A. and Chao, D. C. Y. and Chijani, M. and Gilman, D. and Rojas, K. and Williams, P. and Hempel, A. and Kim, S. and Lachaume, R. and Rabus, M. and Abbott, T. M. C. and Allam, S. and Annis, J. and Banerji, M. and Bechtol, K. and Benoit-Lévy, A. and Brooks, D. and Burke, D. L. and Rosell, A. Carnero and Kind, M. Carrasco and Carretero, J. and D'Andrea, C. B. and da Costa, L. N. and Davis, C. and DePoy, D. L. and Desai, S. and Flaugher, B. and Fosalba, P. and Garcia-Bellido, J. and Gaztanaga, E. and Goldstein, D. A. and Gruen, D. and Gruendl, R. A. and Gschwend, J. and Gutierrez, G. and Honscheid, K. and James, D. J. and Kuehn, K. and Kuhlmann, S. and Kuropatkin, N. and Lahav, O. and Lima, M. and Maia, M. A. G. and March, M. and Marshall, J. L. and McMahon, R. G. and Menanteau, F. and Miquel, R. and Nord, B. and Plazas, A. A. and Sanchez, E. and Scarpine, V. and Schindler, R. and Schubnell, M. and Sevilla-Noarbe, I. and Smith, M. and Soares-Santos, M. and Sobreira, F. and Suchyta, E. and Tarle, G. and Tucker, D. L. and Walker, A. R. and Wester, W.}, biburl = {https://www.bibsonomy.org/bibtex/2a2136128d6c46c392bf0f950cf2790ba/miki}, description = {[1706.09424] COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408-5354 with high-cadence photometric monitoring}, interhash = {75509d224c8c036e2f460d6311035467}, intrahash = {a2136128d6c46c392bf0f950cf2790ba}, keywords = {delay imaging quasar time}, note = {cite arxiv:1706.09424Comment: 9 pages, 5 figures, submitted to Astronomy & Astrophysics. Comments welcome !}, timestamp = {2017-06-30T09:55:13.000+0200}, title = {COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408-5354 with high-cadence photometric monitoring}, url = {http://arxiv.org/abs/1706.09424}, year = 2017 }