The binary central stars of PNe with the shortest orbital periods

TL;DR

This paper reports the discovery of two planetary nebulae with the shortest known orbital periods of their binary central stars, providing insights into binary evolution and nebula shaping.

Contribution

It presents the detection and analysis of two binary central stars with extremely short orbital periods in planetary nebulae, expanding understanding of binary interactions.

Findings

Hen 2-428 has one of the shortest orbital periods among PN binaries.

V458 Vul's central star is in a recent nova system with a bipolar nebula.

Properties suggest close binarity influences nebula morphology.

Abstract

Close binarity can play a significant role in the shaping of planetary nebulae (PNe) as the system evolves through the common-envelope phase. We present the detection of two of the shortest orbital periods among PN binary central stars. These are Hen 2-428, a bipolar PN, and V458 Vul, a recent nova surrounded by a mildly bipolar planetary nebula. The properties of the central stars of these systems, of their nebulae and their possible fate are discussed.