Aubameyang made it 3-0 just as nerves were starting to jangle at the Emirates, finishing off a fine move to put the Gunners ahead on aggregate for the first time in the tie as Emery continued his bid to win the trophy for a fourth time.
Gabon global Aubameyang opened the scoring in the fifth minute then settled nerves at Emirates Stadium with the Gunners' third goal in the second half.
"This comeback was very hard, but I think the reaction was very good from every player", Emery told reporters.
"The 3-1 loss away put us in a very hard situation, but we knew how to deal with that and we got what we deserved".
Rennes certainly threatened throughout, but just simply didn't have the quality at the back to cope with Arsenal's attacking play.
"Playing under pressure is good, growing up under pressure - with each player playing like a team and feeling the hard moments to give us our best performance", Emery said.
All six Premier League teams have progressed to the quarter-final stage of the Champions and Europa League, the first time that has happened since 1971.
Arsenal will be keen to push on in the next round as Unai Emery bids to achieve yet more success in the Europa League.
"Today, Inter (Milan) are out, Sevilla are out - a big surprise".
The Rennes boss Julien Stephan told this correspondent last week after the match at Roazhon Park in deepest Brittany that his team were facing a hard evening at the Emirates in the second leg.
For his side, the focus must always be simple.
The ill-tempered feel to the match continued throughout a nervy second half as a number of strong challenges went unpunished.
"We said that if we were meant to go out, we'd go out with a big performance", Cech added.
Smollett, and we look forward to complete transparency and the truth coming out", she said at a news conference earlier this week. Smollett, who left the courthouse without speaking to reporters, is charged with 16 counts of disorderly conduct.
The author, on her own website, listed this book in the category of "fiction" - until recently changing it. Correcting everything wrong would take too long and be pointless, ' Peter Mirijanian, the spokesman, said.
Former Liverpool defender Steve Nicol claims he was not impressed by Liverpool's performance against Bayern Munich on Wednesday. But if they do go all the way in the Champions League, nobody will be more important to them than Van Dijk.
In a stroke of good luck, an Australian man who had an arrow fired at him managed to block the shot with his mobile phone. He was charged with intent to commit an indictable offence, assault causing bodily harm and malicious damage.
Since then, sources tell us that pressure has increased to make hardware at Google into a "real business". The affected workers have been told to seek temporary roles within other Google or Alphabet teams.
Rockets Fired from Gaza at Tel Aviv, Explosions Heard
Israeli analysts speculated that Palestinian militants opposed to any deal between Hamas and Israel were behind the launchings. A Hamas official told the The Times of Israel that the terror group "has no interest in an escalation" with Israel.
Lori Loughlin Arrested in California
Prosecutors said those claims were false as neither of the Gianulli sisters is a member of the university's rowing team. Huffman appeared court Tuesday and was released on $250,000 bond after surrendering her passport.
New Avengers Endgame trailer has been released
Captain Marvel showing up up in the present! "I like this one", he says after she seems unphased by his hammer trick. Earlier, we had reported that a Marvel will show Avengers: Endgame to a terminally ill fan before the release date .
Brexit hangs in balance over tweaked deal
The EU Commission said it would "expect a credible justification " for the postponement. Effective July 2018, access to full reports will only be available with a subscription.
Celebrate National Pi Day 2019 with these deals
As you may remember from your old geometry class, 3.14 is the shortened version of the mathematical constant known as pi. With 7NOW, the convenience store chain's delivery service, get up to two whole pizzas for $3.14 each.
Jürgen Klopp: Liverpool back as European force
On a night were Liverpool had many outstanding performers, Klopp also paid tribute to Sadio Mane , scorer of the first goal . Van Dijk has made a total of 37 club appearances this season, keeping a remarkable 19 clean sheets in that time.