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J/MNRAS/448/1118 HU Aqr planetary system mid-egress moments (Gozdziewski+, 2015)

The HU Aqr planetary system hypothesis revisited. Gozdziewski K., Slowikowska A., Dimitrov D., Krzeszowski K., Zejmo M., Kanbach G., Burwitz V., Rau A., Irawati P., Richichi A., Gawronski M., Nowak G., Nasiroglu I., Kubicki D. <Mon. Not. R. Astron. Soc., 448, 1118-1136 (2015)> =2015MNRAS.448.1118G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Stars, variable ; Ephemerides Keywords: techniques: photometric - stars: individual: HU Aqr - novae, cataclysmic variables - planetary systems Abstract: We study the mid-egress eclipse timing data gathered for the cataclysmic binary HU Aquarii during the years 1993-2014. The (O-C) residuals were previously attributed to a single ∼7 Jupiter mass companion in ∼5 AU orbit or to a stable two-planet system with an unconstrained outermost orbit. We present 22 new observations gathered between 2011 June and 2014 July with four instruments around the world. They reveal a systematic deviation of ∼60-120 s from the older ephemeris. We re-analyse the whole set of the timing data available. Our results provide an erratum to the previous HU Aqr planetary models, indicating that the hypothesis for a third and fourth body in this system is uncertain. The dynamical stability criterion and a particular geometry of orbits rule out coplanar two-planet configurations. A putative HU Aqr planetary system may be more complex, e.g. highly non-coplanar. Indeed, we found examples of three-planet configurations with the middle planet in a retrograde orbit, which are stable for at least 1 Gyr, and consistent with the observations. The (O-C) may be also driven by oscillations of the gravitational quadrupole moment of the secondary, as predicted by the Lanza et al. modification of the Applegate mechanism. Further systematic, long-term monitoring of HU Aqr is required to interpret the (O-C) residuals. Description: In this paper, we gathered the new measurements in the originally submitted manuscript and the new observations published by Bours et al. (2014MNRAS.445.1924B). We verified that the results obtained without and with their measurements, respectively, differ only up to quantitative sense (i.e. the best-fitting parameters are slightly altered). With the aim of publishing the most up-to-date results possible, we re-analysed available timing data of the HU Aqr eclipses, which are collected in the appendix. Table A1 in this appendix collects mid-egress moments published in the literature, as well as our new data, which were used for the analysis of (O-C) in this paper. Objects: -------------------------------------------------- RA (ICRS) DE Designation(s) -------------------------------------------------- 21 07 58.19 -05 17 40.5 HU Aqr = V* HU Aqr -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 41 215 Mid-egress moments available in the literature.
See also: V/123 : Catalog of Cataclysmic Variables (Downes+ 2001-2006) J/AJ/147/45 : Kepler mission. IV. Eclipse times for close binaries (Conroy+, 2014) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Cycle [0/89340] Cycle number (1) 7- 19 F13.7 d MJD The moment of the mid-egress in Modified Julian Date 21- 29 F9.7 d e_MJD Uncertainty in MJD 31- 39 A9 --- Inst Instrument used for the observation 41 I1 --- r_Inst [1/6] Instrument reference (2)
Note (1): With respect to the epoch BJD 2449102.9200026 (the BJD of the first observation in Schwope et al. 1993A&A...271L..25S). The L=0 cycle here is shifted to epoch T0=BJD 2453504.8882940 with constant offset of 50702 cycles. Note (2): Instruments are code-named in accord with a particular source publication. Reference as follows: 1 = Schwope et al. (2001A&A...375..419S); 2 = Schwarz et al. (2009A&A...496..833S); 3 = Qian et al. (2011MNRAS.414L..16Q); 4 = Gozdziewski et al. (2012MNRAS.425..930G); 5 = Bours et al. (2014MNRAS.445.1924B); 6 = This work.
History: From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 20-Nov-2017
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