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Hubble Space Telescope
XMM-Newton Joint Program Information

XMM-Newton Cycle 16/HST Cycle 25
Joint Program Overview

By agreement with the HST Project, the XMM-Newton Project may award up to 30 orbits of HST observing time each observing cycle. Similarly, the HST Project may award up to 150 ks of XMM-Newton time. The time will be awarded only for highly ranked proposals that require the use of both observatories and shall not apply to usage of archival data. The only criterion above and beyond the usual review criteria is that both sets of data are required to meet the primary science goals. Proposers should have taken special care in justifying both the scientific and technical reasons for requesting observing time on both missions. For these solicitations, no HST time will be allocated without the need for XMM-Newton time on the same target to complete the proposed investigation.

For XMM-Newton's Cycle 16 and HST's Cycle 25, the XMM-Newton Observing Time Allocation Committee (OTAC) met in the fall of 2016 and reviewed their proposals. The following three joint XMM-Newton proposals (listed below) have been approved for execution in HST Cycle 25. These observations have been loaded with the current Cycle 24 programs.

Understanding the Super-Eddington phase in a Decade-long Tidal Disruption Event

Dacheng Lin
University of New Hampshire
Program ID: 14905

We have discovered a decade-long X-ray tidal disruption candidate, which recent observations suggest to be still in the super-Eddington accretion phase but with sporadic dramatic spectral softening. We request three XMM-Newton monitorings in AO16 on this target, which is unique for study of the super-Eddington accretion onto supermassive black holes. The goals are to confirm its still being in the super-Eddington accretion phase and to measure the spectral softening occurrence rate, allowing us to determine whether the spectral softening is due to transient high-speed warm absorbers or state transition. We also request an HST orbit to help confirm the nuclear origin of the event and study its environment.

J150052+0154 15 00 52.07 +01 54 53.84 WFC3/UVIS F606 & F814 1

UV irradiation of the Earth-sized planets orbiting TRAPPIST-1

Peter Wheatley
The University of Warwick
Program ID: 14906

The remarkable discovery of a system of three Earth-sized potentially-habitable planets transiting the ultra-cool dwarf TRAPPIST-1 provides an unprecedented opportunity for detailed study of the atmospheres of terrestrial exoplanets. Our analysis of an archival XMM-Newton observation of the star revealed XUV radiation that was fifty times stronger than assumed in a theoretical study of the planetary atmospheres, with enough XUV irradiation to profoundly modify and perhaps entirely strip those atmospheres. Here we propose a longer XMM-Newton observation that will cover a full spin cycle of the star and more accurately define the XUV irradiation of the exoplanets. This is an essential step in assessing the habitability of these and similar exoplanets around ultra-cool dwarfs.

TRAPPIST-1 23 06 30.34 -05 02 36.44 STIS/CCD ACQ 0
TRAPPIST-1 23 06 30.34 -05 02 36.44 STIS/FUV G140L 3

Probing the merger-induced feedback scenario in hyper-luminous quasars

Luca Zappacosta
INAF, Osservatorio Astronomico di Roma
Program ID: 14908

We are following up through multiwavelength observations the WISSH sample of hyperluminous MIR-selected Type 1 quasars at z~2.5-3.5. In these objects we expect powerful quasar feedback and galaxy mergers to manifest themselves in full force. We are finding the WISSH quasars to exhibit a mixture of two populations with powerful winds in different gas phases (OIII or CIV). They also seem to show a dichotomy in their X-ray luminosities and UV/X-ray slope. We propose here XMM and HST observations of three WISSH quasars showing powerful OIII outflows in order to establish whether (i) they have higher X-ray-to-MIR and X-ray-to-UV luminosity ratios compared to the CIV-wind population and (ii) powerful quasars in the blow-out phase are linked to mergers.

SDSSJ1326-00 13 26 54.96 00 05 30.16 WFC3/IR F160W 1

The programs approved from the previous XMM Cycle 11-15 TACs can be found at the following links: